Peat grows at 1 millimeter per year. One millimeter. A human fingernail grows faster. That means a 3-meter-deep peat column represents roughly 3,000 years of carbon accumulation, locked in place by cold, waterlogged, oxygen-starved conditions. Then someone digs a drainage ditch, and within years, that carbon starts leaving. Not slowly. Fast.
Here is the mechanism, and it matters: waterlogged peat is anaerobic. No oxygen means microbial decomposition stalls. The carbon just sits there, compressed and preserved, the way a spacecraft component survives in vacuum. Drain the water, introduce oxygen, and the microbes wake up. They eat the peat. They exhale CO2. The sink becomes a source, and there is no switch to flip it back quickly.
The Numbers That Should Make You Angry
UK peatlands store carbon equivalent to up to 8 years of the UK's total national emissions. That is not a rounding error. That is a strategic reserve, and the UK spent the 1940s and 1950s systematically draining it. Post-war agricultural incentives pushed moorland keepers to cut "grips," narrow drainage channels, across upland peat. Those grips eroded into gullies 3 meters deep and 4 meters wide. Thousands of years of accumulation, washing downhill.
Globally, wetlands including peatlands have lost 22% of their area since 1970, with a 0.52% annual decline still ongoing according to the Global Wetland Outlook 2025. Peatlands hold twice the carbon of all global forests combined, in a fraction of the footprint. We are losing them at a rate that no reforestation program can compensate for.
In 2023, the global carbon sink nearly collapsed. Fires, floods, and heat stress pushed land and ocean systems so hard that net carbon uptake approached zero. Drying peat systems were part of that story. Overwintering peat fires in Russia's boreal forests now persist underground through winter and reignite in spring. The feedback loop is not theoretical anymore.
The Tree-Planting Trap
Here is where I have to acknowledge something uncomfortable: the rewilding debate is genuinely complicated. Moorland keepers in the UK argue, with real data behind them, that planting trees on high moors would actually dry the peat by pulling water from the soil. Wet peat stores 10 times more carbon than woodland. Blanket tree-planting on upland peat is not a climate solution. It is a carbon accounting error dressed up as environmentalism.
The right intervention is grip-blocking: physically plugging the old drainage channels, raising the water table, letting sphagnum moss recolonize. It is unglamorous engineering. No ribbon-cutting, no satellite imagery of new forest canopy. Just water, slowly returning to where it belongs.
Grip-blocking also improves downstream water quality and reduces flood peaks. Those are co-benefits that any infrastructure engineer would recognize as a bonus, not the primary justification. The primary justification is that you are protecting a carbon store that took 3,000 years to build and can be destroyed in a generation.
I cover rockets because I believe in engineering solutions to hard problems. Peat rewetting is one of the highest-return carbon interventions on the table right now: low cost, proven mechanism, immediate effect on emissions, measurable results. The UK government keeps funding tree-planting schemes on land where trees do not belong, while the grips keep draining. That is not a policy disagreement. That is an engineering mistake, and the peat does not care about the budget cycle any more than a rocket cares about the election calendar.
Block the grips. Raise the water. The carbon will stay put for another 3,000 years if you let it.
