I have been very critical of past COP meetings yet still retain hope that they will actually cut through at some stage in the future. But not this year, I fear. We gather at COP30 in Belém with our gaze fixed steadfastly on carbon budgets and net‑zero pledges, as though the crisis were a simple matter of atmospheric chemistry. It’s not. What we face is the unravelling of the planet’s most sophisticated climate control system, and our models have been too narrow to see it coming.
Since 2023, extreme weather has routinely shattered projections. Meteorologists find themselves in uncharted territory, not because the physics changed but because we left a stable climate behind and our dominant frameworks failed to account for what mattered most. Our tunnel vision on carbon has blinded us to a more urgent truth: forests are not merely sinks that sequester emissions. They are active regulators of temperature, rainfall and continental habitability. Destroy them, and you don’t just release stored carbon. You dismantle the machinery that keeps vast regions liveable.
This is not a metaphor. It’s the physics of what researchers call the biotic pump. Trees transpire enormous volumes of water vapour. As that vapour rises and condenses into clouds—aided by aerosols the plants themselves release—the phase transition from gas to liquid shrinks volume abruptly, creating low pressure at the surface. That pressure gradient pulls humid air from the oceans deep into continents, sustaining rainfall thousands of kilometres inland. The Amazon draws moisture from the North Atlantic across the equator and into South America. Siberian boreal forests maintain the atmospheric rivers that water Europe, China and Central Asia. These are not local effects. They are planetary arteries.
The theory was pioneered by Russian scientists Anastassia Makarieva and Victor Gorshkov, working closely with Brazilian researchers including Antonio Donato Nobre. It rests on fundamental thermodynamics, has been published and tested, and explains phenomena that carbon‑centric models struggle to capture. Yet for nearly two decades it has been marginalised in the frameworks that guide government policy. The result is that we have underestimated the Amazon’s vulnerability, the speed at which tipping points approach, and the cascading consequences of ecosystem loss.
Remove the trees and the pump breaks. Transpiration ceases. Humid air is no longer drawn inland. Clouds vanish. The natural cooling collapses. Where dense canopy once reflected up to seventy per cent of solar radiation back to space, bare ground now absorbs that heat. Massive bubbles of hot, dry air settle over deforested regions, blocking moisture flows and triggering arid conditions across vast areas. This is not a slow drift. It is a phase shift, and it amplifies regional warming far beyond what carbon dioxide alone can explain.
Indigenous wisdom has long understood this. Davi Kopenawa Yanomami put it plainly: if you cut down the forest, the rain will dry up. That’s not folklore. It is an accurate summary of the hydrology we’re now scrambling to model. The biosphere conquered continents over four hundred million years through mechanisms of staggering complexity. Spores, seeds, roots, canopies, mycorrhizal networks—these are technologies we cannot replicate. They regulate water, moderate temperature, generate clouds, sustain soils and anchor the conditions under which agriculture, cities and human societies persist.
Here’s the uncomfortable implication. Even if we zeroed out carbon emissions tomorrow—a goal still worth pursuing—the climate emergency would persist without massive ecological restoration. Carbon dioxide drives long‑term warming, but ecosystem destruction introduces a dangerous short‑term multiplier. By breaking the ocean‑atmosphere‑land water cycle, we drastically amplify the climate’s sensitivity to CO². We’re not just adding heat. We’re disabling the systems that dissipate it.
This has direct consequences for policy and finance. Agriculture and cattle ranching are the primary vectors of forest loss. Reforming those sectors is not optional. Nor can we continue funnelling billions into carbon offset schemes—monoculture tree farms that look tidy on a ledger but fail to replicate the hydrological function of native forests.
The failure to model the biotic pump has allowed us to misallocate resources and misread risk. It has permitted a discourse in which “preservation” competes with “development” as though the two were symmetrical trade‑offs. They are not. The stability of continental rainfall, the productivity of agriculture, the availability of potable water, and the moderation of heat—all depend on intact ecosystems performing functions no technology can substitute at scale. This is not romantic idealism. It’s thermodynamics and hydrology, an operating manual we have chosen to ignore.
Belém offers a chance to correct course. Hosting COP30 in the Amazon is not just symbolic; it positions these most critical negotiations inside the engine room of continental climate regulation. The question is not whether we value the forest, but how. If the summit confines itself to familiar carbon arithmetic, we will miss the point yet again. The work now is to elevate ecosystem integrity (ecority) from a peripheral concern to the primary organising principle of climate action—recognising forests as irreplaceable climate machinery and freshwater generators, not simply as carbon accounts on legs.
That requires changes at three levels. First, protection with teeth. Illegal clearing must become unthinkable because it’s impossible to profit from it—through enforcement, transparent land registries, supply‑chain accountability and trade measures that shut markets to products linked to deforestation. Indigenous territories, which consistently outperform other governance regimes in preventing forest loss, need secure land rights and resourced guardianship. This is not charity. It’s strategic climate policy.
Second, restoration that restores function, not just numbers on a ledger. Monoculture plantations do not replicate how forests think: canopy complexity, soil microbiomes, or the microphysics of cloud formation. Where landscapes are degraded, we should prioritise diverse native forests and mosaics that stitch moisture pathways back together, guided by local ecologies and knowledge. Finance must follow function: redirect funds from short‑term offsets into long‑term protection and hydrologically literate restoration that rebuilds the biotic pump.
Third, models, metrics and laws that catch up with reality. Moisture recycling, cloud albedo and land–atmosphere feedbacks must be integrated into climate models and risk assessments. National accounts and climate law should recognise the value of intact ecosystems as critical infrastructure—cooling surfaces, generating rain, and stabilising seasons. When we price what forests actually do, policy and capital will have fewer excuses to neglect them.
The drivers of loss are not mysteries. Agricultural frontiers and cattle ranching continue to chew into the Amazon and other forests, often under the nonsensical banner of (sustainable) development. But there’s nothing developmental about undermining the rainfall that agriculture itself depends on. Reforming subsidies that reward clearance, supporting intensification on already degraded lands, and rewarding producers who keep forests standing are basic common sense, not radicalism.
We should also be honest about technology. There’s no machine that can pull moisture inland, seed clouds over a continent, reflect summer sunlight at scale, and deliver predictable rain to farms thousands of kilometres from the sea. The services that intact forests provide are ultra‑complex and emergent. We can measure them; we cannot replace them.
This is not a counsel of despair. The biosphere’s capacity to recover is extraordinary if we stop attacking it and help it heal. Moisture pathways can be re‑established; microclimates can recover; rainfall can return. But time matters. Nature once had aeons to iterate. We do not. Every additional year of attrition shrinks the margin for a gentle return to stability.
COP30 can be remembered for one decisive shift: acknowledging that safeguarding and repairing the living fabric of the Earth is the central task of climate policy, not an afterthought. If Belém can align law, finance and enforcement with that truth—if it can anchor Indigenous stewardship, halt destructive frontiers, fund real restoration, and insist that our models and metrics reflect the physics—then the Amazon will not only store carbon. It will keep the rains coming.
The choice is not abstract. Food and water security, heat moderation, the viability of cities and farms across entire continents—these all depend on whether we treat forests as expendable scenery or as the climate infrastructure they are. We have spent far too long arguing over numbers while dismantling the system that makes any number tolerable. It’s time to place the living world at the centre of the deal. Will COP30 deliver that? We can but hope!