The Rain Follows After the Forest
Technical White Paper for Climate Adaptation Funders
| March 2026 | Working Draft v2.0 |
Prepared for consideration by philanthropic organizations, climate adaptation funds, and conservation investors seeking high-leverage interventions at the intersection of forest health, water security, and atmospheric science.
The western United States is experiencing a convergence of drought, forest die-off, and watershed degradation that threatens water security for tens of millions of people. Colorado has activated its Drought Task Force for the first time since 2020, with snowpack at its lowest since 1981 and the warmest winter in 132 years of record. Simultaneously, mountain pine beetle is poised to kill most mature ponderosa pines along the Front Range within a decade. These are not separate crises—they are components of a single, self-reinforcing feedback loop in which drought weakens forests, forest loss reduces atmospheric moisture recycling, and diminished moisture deepens drought.
This paper proposes a framework called Continental Moisture Relay Infrastructure (CMRI): a staged, modular investment strategy that treats forest ecosystems as engineered atmospheric moisture infrastructure, connecting Pacific Ocean moisture sources to interior continental watersheds through a chain of forest restoration and protection zones. The approach is grounded in established atmospheric science—principally the moisture recycling literature, the biotic pump hypothesis, and recent discoveries from CERN’s CLOUD experiment demonstrating that forest-emitted monoterpenes are essential precursors to cloud condensation nuclei—and is designed to deliver measurable local returns at each stage while building long-range hydrological resilience.
“Forests are complex self-sustaining rainmaking systems, and the major driver of atmospheric circulation on Earth.” — Anastassia Makarieva, Petersburg Nuclear Physics Institute
A Hawaiian proverb holds that hahai no ka ua i ka ululāʻau—the rain follows after the forest. Modern atmospheric science confirms this indigenous insight through three distinct mechanisms: forests generate downwind rainfall through transpiration and moisture recycling; they may actively draw moist oceanic air inland through condensation-driven pressure gradients (the biotic pump hypothesis); and they emit volatile organic compounds—principally monoterpenes—whose oxidation products serve as cloud condensation nuclei, the physical seeds upon which cloud droplets form.
Across the western U.S., this cycle is now running in reverse:
Drought. Colorado is experiencing the warmest start to a water year in over 130 years. Snowpack is at its lowest since 1981. Governor Polis activated the Drought Task Force on March 16, 2026, moving the state into Phase 2 of its Drought Response Plan. Forecasters expect warm, dry conditions to persist at least through June 2026.
Forest Die-off. Mountain pine beetle is spreading aggressively through ponderosa pine forests from Larimer County to El Paso County. Federal projections indicate most mature ponderosa pines on the western Front Range will be killed within the next decade. Spruce beetle continues to damage high-elevation Engelmann spruce forests in the southern Rockies. The 1996–2013 epidemic already killed trees across 3.4 million of Colorado’s 4.1 million forested acres; the remaining 700,000 acres on the Front Range are now at risk.
Watershed Degradation. Dead and dying forests alter wildfire behavior, reduce snowpack interception, degrade soil moisture retention, and increase erosion—all of which reduce the capacity of mountain watersheds to capture, store, and slowly release water. The Colorado River Basin reports record-low snow water equivalent, and initial irrigation allocations are being set at survival minimums.
Feedback Amplification. Each element worsens the others. Drought-stressed trees produce less resin and cannot resist beetle attack. Dead forests transpire no moisture, reducing local and downwind precipitation. Reduced precipitation deepens drought. The absence of sustained cold periods (weeks below zero) that historically controlled beetle populations is itself a consequence of the warming trend.
The fundamental insight is that these are not problems to be solved in isolation. Forest health, water supply, and atmospheric moisture are coupled systems. Investment strategies must address the coupling itself.
The role of terrestrial evapotranspiration in sustaining continental precipitation is well-established in the atmospheric science literature. Globally, approximately 40% of precipitation over land originates from terrestrial evapotranspiration rather than direct oceanic moisture transport (van der Ent et al., 2010). In some regions the fraction is far higher: China’s water resources depend on Eurasian continental moisture recycling for roughly 80% of precipitation, and the Rio de la Plata basin in South America depends on Amazonian transpiration for approximately 70% of its rainfall.
In North America specifically, terrestrial evapotranspiration contributes up to 80% of summertime precipitation in some regions and approximately 40% of annual precipitation continent-wide (Harrington et al., 2023; van der Ent et al., 2010). Critically, bulk recycling ratios are generally higher across western North America, meaning that changes in vegetation and land cover in the West could affect precipitation patterns across the entire continent (Dirmeyer & Brubaker, 2007).
Recent research has revealed a powerful nonlinearity in these dynamics: in the Amazon, a 13% reduction in atmospheric moisture from loss of forest transpiration could result in a 55–70% decrease in precipitation (Staal et al., 2020). The inverse implication is equally important: forest restoration may be substantially more effective at enhancing precipitation than linear models would predict.
The biotic pump hypothesis, developed by Anastassia Makarieva and the late Victor Gorshkov at the Petersburg Nuclear Physics Institute and first published in Hydrology and Earth System Sciences in 2007, proposes a more radical mechanism: that forest transpiration and subsequent atmospheric condensation create pressure gradients that actively draw moist oceanic air inland. In this framework, it is not atmospheric circulation that drives the hydrological cycle, but the hydrological cycle—powered by forests—that drives atmospheric circulation.
The theory predicts two distinct continental precipitation patterns: in forested regions, rainfall remains approximately constant with distance from the ocean; in deforested regions, rainfall declines exponentially. Empirical data from the world’s largest river basins (Amazon, Congo, and boreal Siberian rivers) are consistent with these predictions. In the Amazon and Congo basins, precipitation is roughly twice the oceanic rate and does not decrease inland. In deforested regions, precipitation drops sharply within a few hundred kilometers of the coast.
The biotic pump remains controversial within mainstream atmospheric science. However, even without accepting the full theory, the well-established moisture recycling literature alone provides sufficient scientific basis for treating forests as critical moisture infrastructure. The biotic pump, if validated, would make the case even stronger—and investment in forest restoration could be viewed as a hedge on a theory with enormous upside if correct.
Moisture recycling operates as a relay: forests transpire water, which condenses, falls as precipitation, is taken up by the next stand of forest, and transpired again. Each cycle moves moisture further inland. Research shows that moisture evaporated from land travels 500–5,000 km in the atmosphere before precipitating again (Ellison et al., 2017). This means that a chain of healthy forest zones can function as a moisture pipeline—each zone receiving moisture from upwind, recycling it, and passing it downwind to the next.
Conversely, a break in the chain—a deforested or degraded zone—acts as a moisture sink, absorbing incoming moisture without recycling it, and starving downwind ecosystems. The critical insight for infrastructure planning is that the relay can be designed, built, and maintained just as any other critical infrastructure system.
Beyond transpiration and condensation-driven pressure dynamics, forests influence precipitation through a third mechanism that has only recently been quantified: the emission of biogenic volatile organic compounds (BVOCs), principally monoterpenes, that serve as precursors to cloud condensation nuclei (CCN).
Coniferous forests — ponderosa pine, lodgepole pine, Douglas fir, and spruce — emit substantial quantities of monoterpenes (C₁₀H₁₆), including α-pinene, β-pinene, Δ³-carene, and limonene. Globally, vegetation emits over 100 TgC per year of monoterpenes into the atmosphere (Nature, 2022). Once airborne, these compounds are rapidly oxidized by hydroxyl radicals and ozone, producing extremely low-volatility organic compounds (ELVOCs) that condense onto existing particles or nucleate entirely new ones. This process — biogenic secondary organic aerosol (BSOA) formation — generates particles that grow from molecular clusters (~1 nm) to cloud condensation nuclei (~100 nm), the seeds upon which cloud droplets form.
The significance of this pathway was established definitively by the CLOUD (Cosmics Leaving Outdoor Droplets) experiment at CERN, which demonstrated that oxidized biogenic vapors derived from α-pinene bind with sulfuric acid to form embryonic particles capable of growing into cloud seeds (Kirkby et al., Science 2016; Kirkby et al., Nature Geoscience 2023). CLOUD spokesperson Jasper Kirkby described this as identifying “a key ingredient responsible for formation of new aerosol particles over a large part of the atmosphere.” Unlike amines, which are only found near point sources, α-pinene is ubiquitous over landmasses wherever coniferous forests exist.
The quantitative importance is substantial: new particle formation produces approximately 40–70% of all cloud condensation nuclei globally (Dunne et al., Science 2016; Merikanto et al., 2009). CERN’s global model based on CLOUD measurements found that nearly all atmospheric nucleation involves either ammonia or biogenic organic compounds in addition to sulfuric acid. Although monoterpenes account for roughly 15% of global BVOC emissions by volume, they contribute approximately 45% of all BVOC-related secondary organic aerosol formation due to their high SOA yields from endocyclic double-bond ozonolysis (Jokinen et al., PNAS 2015). The PNAS study further showed that high yields of ELVOCs from atmospheric oxidation of BVOCs enhance both the formation of new aerosol particles and their subsequent growth to CCN sizes.
For CMRI, the monoterpene-CCN pathway represents a second precipitation mechanism operating in parallel with moisture recycling. Forests do not merely recycle water vapor — they manufacture the physical particles upon which that vapor condenses into rain. A healthy coniferous forest simultaneously loads the atmosphere with moisture (through transpiration) and seeds it with the nuclei needed to convert that moisture into precipitation (through monoterpene emission). Kill the forest, and you lose both the water and the cloud seeds. Restore it, and you rebuild both channels simultaneously.
This has specific quantitative implications for the western U.S. relay corridor:
Ponderosa pine, the species most at risk from the current beetle outbreak, is a significant monoterpene emitter. Research in ponderosa pine forests in central Oregon found that α-pinene and β-pinene emissions are driven primarily by needle monoterpene concentrations and temperature, with emission rates increasing exponentially with warming (Lerdau et al.). The same drought-stressed and beetle-killed forests that have stopped transpiring moisture have also stopped emitting the monoterpenes that seed cloud formation downwind.
Drought suppresses monoterpene emissions, but the relationship is complex. Research on pinyon pine (a close ecological analog to ponderosa in semiarid western systems) found that drought overrides herbivory as the primary control on monoterpene emissions during mid-summer, but that the onset of monsoon rains triggers a secondary emission spike (Trowbridge et al., 2014). This suggests that even modest increases in precipitation from the relay’s moisture recycling function could trigger amplified monoterpene emissions, creating a positive feedback: more rain → more terpenes → more CCN → more clouds → more rain.
Beetle-attacked trees temporarily increase monoterpene emissions as a defense response (resin production spikes during attack), but this is a short-lived phenomenon. Once the tree is dead, emissions cease permanently. The net long-term effect of widespread beetle kill is a massive reduction in landscape-scale monoterpene flux to the atmosphere.
The monoterpene-CCN pathway strengthens the CMRI investment thesis by adding a second mechanism through which forest restoration generates precipitation. It also adds urgency: every acre of coniferous forest lost to beetle kill is not just a loss of transpiration capacity, but a loss of cloud-seeding capacity. The two mechanisms compound, meaning that the precipitation impact of forest loss — and conversely, the precipitation return on forest restoration — is larger than moisture recycling calculations alone would suggest.
CMRI proposes treating the Pacific-to-Rockies moisture corridor as engineered infrastructure composed of four relay stages. Each stage is independently valuable and fundable, but the system’s full potential is realized when the stages are connected.
| Stage | Geography | Function | Key Interventions |
|---|---|---|---|
| 1 | Pacific Coast (CA, OR, WA) | Primary moisture source; first-stage transpiration pump; coastal BVOC emissions | Solar desalination for drought resilience of coastal forests; redwood and temperate rainforest conservation; fog-belt protection |
| 2 | Sierra Nevada / Cascade Range | Orographic lift and moisture capture; secondary recycling; high-elevation monoterpene-CCN production | Forest thinning and prescribed fire to restore resilience; beetle mitigation; watershed protection |
| 3 | Great Basin (NV, UT, ID) | Moisture relay bridge across the arid interior; sagebrush VOC contributions | Sagebrush ecosystem restoration; riparian corridor expansion; beaver dam analog (BDA) installation; targeted reforestation at elevation |
| 4 | Rocky Mountain Front Range | Terminal moisture receiver; watershed headwaters; ponderosa pine monoterpene-CCN production zone | Post-beetle reforestation with diverse conifer species mixes; prescribed fire; watershed restoration; community wildfire resilience |
California’s coastal forests—redwoods, Douglas fir, Sitka spruce—are the first link in the western moisture relay. Redwood forests capture moisture directly from marine fog through foliar uptake, and coastal forests collectively transpire enormous volumes that seed downwind precipitation. Protecting and expanding these forests is the highest-leverage intervention in the relay because they are closest to the oceanic moisture source and set the initial conditions for the entire inland chain.
Solar-powered desalination provides the enabling technology for drought resilience at the coast. The economics have shifted decisively: solar power costs have dropped below coal and gas, making renewable desalination viable at scale for the first time. Terraformation has demonstrated an end-to-end solar desalination and reforestation system in Hawaiʻi producing 128,000 liters of freshwater per day—sufficient to support thousands of trees. Israel’s network of desalination plants delivers approximately 650,000 acre-feet of fresh water annually along the Mediterranean, with plans to reach 730,000 acre-feet by 2027. California’s coastline could support similar capacity, and the state has begun approving new desalination facilities.
The critical reframing: desalination at the coast is not just a municipal water supply strategy. When coupled with forest restoration, it becomes the seed capital for a continental moisture relay—investing water at the coast to generate precipitation hundreds of miles inland.
The western mountain ranges provide the orographic lift that forces moist air upward, cools it, and extracts precipitation. Healthy forests on the western slopes maximize moisture interception and recycling. These forests face their own beetle and drought pressures, and active management—thinning to reduce competition, prescribed fire to restore historical stand structure, and beetle mitigation—is essential to maintaining their role as moisture amplifiers. Existing federal and state forest health programs provide a foundation, but investment at the scale required to maintain the relay function far exceeds current funding.
The Great Basin is the weakest link in the relay and the greatest opportunity for transformative investment. Spanning approximately 550,000 square miles across Nevada, Utah, and surrounding states, the Great Basin is characterized by aridity (over half receives less than 12 inches of annual precipitation) and degraded vegetation. Approximately 45% of the historical sagebrush range has been lost to wildfire, invasive annual grasses, and conifer encroachment.
CMRI does not propose converting the Great Basin into dense forest—that would be ecologically inappropriate. Instead, the strategy focuses on restoring and expanding the Basin’s native moisture-recycling capacity through sagebrush ecosystem restoration, riparian corridor expansion using beaver dam analogs, targeted reforestation at suitable elevations, and invasive grass control to allow native perennial vegetation to re-establish. Even modest increases in vegetative cover across such a vast area could meaningfully increase transpiration and moisture recycling, bridging the gap between the Sierra and the Rockies.
Existing programs—including the BLM’s 223-million-acre sagebrush restoration initiative, TNC’s Sagebrush Sea Program, and USFWS’s Bipartisan Infrastructure Law investments—provide institutional infrastructure to scale.
The Front Range is both the terminal beneficiary of the relay and a system in active crisis. With beetle-kill projections showing near-total mature ponderosa mortality within a decade, the question is not whether these forests will be transformed, but what replaces them. CMRI positions post-beetle reforestation as a strategic investment in long-term moisture reception capacity, emphasizing diverse species mixes, varied age classes, and fire-adapted stand structures that resist future outbreaks. The task force structure Governor Polis has established provides a coordination framework; philanthropic investment could dramatically accelerate the timeline and scale of restoration.
The monoterpene-CCN dimension adds urgency to Front Range reforestation. Ponderosa pine forests are significant emitters of α-pinene and β-pinene, compounds whose oxidation products are among the most effective precursors to atmospheric cloud condensation nuclei (as demonstrated by CERN’s CLOUD experiment). The ongoing beetle kill is not only eliminating transpiration capacity but also shutting down a landscape-scale cloud-seeding system. Reforestation with diverse conifer species — selected not only for climate resilience and beetle resistance but also for BVOC emission profiles — could restore both moisture recycling and CCN production simultaneously. Species selection should explicitly consider monoterpene emission characteristics alongside traditional silvicultural criteria.
CMRI is designed for staged, independent investment with compounding network effects:
Modular Deployment. Each stage delivers measurable local benefits independently—fire risk reduction, watershed protection, biodiversity, carbon sequestration—regardless of whether other stages are funded. This eliminates the all-or-nothing risk profile that plagues most large-scale infrastructure proposals.
Compounding Network Effects. As relay stages are connected, the moisture recycling benefit compounds nonlinearly. Research in the Amazon suggests that the relationship between forest cover and precipitation is nonlinear—a 13% reduction in atmospheric moisture from deforestation could cause a 55–70% reduction in precipitation. The inverse implication is that restoration returns accelerate as coverage increases.
Leveraging Existing Programs. CMRI does not require building new institutions from scratch. The BLM sagebrush restoration program, state forest health initiatives, USFWS Bipartisan Infrastructure Law investments, and state drought/beetle task forces all provide delivery infrastructure. Philanthropic capital can be catalytic—accelerating, connecting, and scaling existing efforts rather than duplicating them.
Asymmetric Upside. If the biotic pump hypothesis is validated—that forests not only recycle moisture but actively drive the winds that transport it—the returns from CMRI investment would be transformatively larger than current models predict. Investing in the relay is a rational hedge: substantial returns under the established moisture recycling science, with potential for order-of-magnitude upside under biotic pump dynamics.
Multi-Benefit Returns. Each dollar invested in forest moisture infrastructure simultaneously delivers: water supply security, wildfire risk reduction, carbon sequestration, biodiversity habitat, agricultural resilience, recreation and tourism value, property and infrastructure protection, and insurance cost reduction.
Dual Precipitation Mechanisms. CMRI investments restore two parallel precipitation pathways simultaneously: moisture recycling (transpiration → condensation → downwind precipitation) and biogenic CCN production (monoterpene emission → aerosol nucleation → cloud seeding). These mechanisms compound: a restored conifer forest loads the atmosphere with both the water vapor and the cloud condensation nuclei needed to convert that vapor into rain. Models based on moisture recycling alone likely underestimate the precipitation return on forest restoration investment.
| Metric | Value | Source |
|---|---|---|
| Global land precipitation from terrestrial ET | ~40–50% | van der Ent et al. 2010; Eltahir & Bras 1994 |
| N. American summer precipitation from land ET | Up to 80% | Harrington et al. 2023 |
| African rainfall from transpiration | ~50% (5–68% by watershed) | Ayana et al. 2022 (PMC) |
| Atmospheric moisture travel distance | 500–5,000 km | Ellison et al. 2017 |
| Nonlinear precipitation response (Amazon) | 13% moisture loss → 55–70% rain loss | Staal et al. 2020 (PMC) |
| Great Basin sagebrush loss | ~45% of historical range | BLM PEIS 2020 |
| CO beetle-kill (1996–2013) | 3.4M of 4.1M forested acres | CSFS 2025 |
| CO Front Range acres at risk | ~700,000 acres | Boulder Reporting Lab 2026 |
| CO snowpack (March 2026) | Lowest since 1981 | CO Climate Center 2026 |
| Terraformation desal output | 128,000 L/day (solar) | Terraformation 2020 |
| Israel desal capacity | 650K acre-ft/yr (to 730K by 2027) | CA Policy Center 2026 |
| Global monoterpene emissions | >100 TgC/year | Nature 2022 |
| Monoterpene contribution to BVOC-related SOA | ~45% | Jokinen et al. 2015 (PNAS) |
| New particle formation → global CCN | 40–70% of all CCN | Dunne et al. 2016; Merikanto et al. 2009 |
| α-Pinene global emission | ~50 TgC/year (most abundant monoterpene) | ACS Central Science 2017 |
| Ponderosa pine dominant monoterpenes | α-pinene, β-pinene, Δ³-carene | Lerdau et al.; USFS |
Note: These figures are drawn from peer-reviewed literature and government reports. The CMRI framework proposes applying these established dynamics as engineering principles.
Intellectual honesty requires acknowledging the significant uncertainties and challenges inherent in this proposal:
Scientific uncertainty. The biotic pump hypothesis remains contested. While moisture recycling is established science, the magnitude of forest-driven atmospheric circulation effects is still debated. The nonlinear precipitation responses observed in tropical systems may not translate directly to temperate and arid western U.S. contexts.
Scale and timeline. Continental-scale moisture relay infrastructure is a multi-generational project spanning dozens of political jurisdictions, millions of acres, and decades of time. There is no precedent for coordinating ecological restoration at this scale.
The Great Basin gap. The arid interior is the weakest link. Establishing sufficient vegetative cover to meaningfully increase moisture recycling across the Basin is an enormous ecological and logistical challenge. Invasive annual grasses, wildfire, and limited water availability are persistent barriers.
Climate trajectory. If warming accelerates beyond current projections, the viability of forest restoration in some areas may be compromised. Species selection must account for projected future conditions, not just present ones.
Measurement and attribution. Demonstrating that CMRI investments cause measurable increases in downwind precipitation will require sophisticated monitoring and long time series. Attribution is inherently difficult in complex atmospheric systems.
Desalination externalities. Brine discharge, marine ecosystem impacts, and energy requirements are real constraints on coastal desalination, though advances in renewable energy and brine management are steadily reducing these concerns.
Monoterpene-CCN quantification gaps. While the CERN CLOUD experiment has established the biogenic nucleation mechanism under controlled conditions, translating these findings to quantitative CCN production rates for specific forest types and climatic contexts remains an active research area. The relationship between landscape-scale monoterpene emissions and regional CCN concentrations involves complex atmospheric chemistry (oxidation rates, pre-existing aerosol surfaces, NOₓ regimes) that varies by location and season. Additionally, while biogenic SOA can serve as CCN, some research indicates that high ratios of organic aerosol to sulfate can reduce hygroscopicity, potentially moderating CCN activation efficiency in some conditions. The net effect on precipitation of restoring monoterpene emissions at landscape scale has not been directly measured.
We propose the following near-term investment priorities to begin building the relay:
Fund a CMRI Feasibility Study ($2–5M). Commission a multi-institutional atmospheric modeling study to quantify potential moisture recycling gains from staged forest restoration along the Pacific-to-Rockies corridor. Partner with NCAR, NOAA’s NIDIS, and university atmospheric science departments to model relay dynamics under multiple scenarios.
Pilot Stage 1: Coastal Desalination for Forest Resilience ($10–25M). Fund solar desalination installations explicitly coupled with coastal forest restoration in Northern California or Oregon. Instrument the sites to measure transpiration, moisture flux, and downwind precipitation effects. Build on Terraformation’s proven model.
Accelerate Stage 3: Great Basin Moisture Bridging ($15–50M). Invest in scaling beaver dam analog and riparian restoration programs across the Great Basin, building on TNC’s Sagebrush Sea Program and BLM restoration infrastructure. Focus on creating connected vegetation corridors along moisture transport pathways.
Stage 4: Front Range Post-Beetle Reforestation ($10–30M). Partner with Colorado’s Ponderosa Mountain Pine Beetle Task Force to fund large-scale nursery production of diverse native seedling stock for post-beetle reforestation. Prioritize species mixes designed for climate resilience and moisture recycling function.
Establish a CMRI Monitoring Network ($5–10M). Deploy atmospheric moisture monitoring stations along the relay corridor to establish baseline measurements and track changes as restoration progresses. Include BVOC flux measurements (monoterpene speciation and concentration) and aerosol particle counters at key forest sites to quantify the monoterpene-CCN pathway alongside moisture recycling. Integrate with existing SNOTEL, NIDIS, and Drought Monitor infrastructure.
“Hahai no ka ua i ka ululāʻau.” The rain follows after the forest. The question before us is whether we will invest in rebuilding the forest so the rain can follow—or continue to watch both disappear.
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