Offsetting vs. Removal
Carbon offsetting prevents emissions that would have happened โ for example, by funding a wind farm instead of a coal plant. Carbon removal goes a step further: it actively pulls CO2 that is already in the atmosphere back out. Both matter, but removal addresses the carbon that has been accumulating for over a century and that offsetting alone cannot undo.
Natural Removal
Nature has always cycled carbon. Trees absorb CO2 as they grow, storing it in wood and roots. Healthy soils hold enormous amounts of carbon, especially grasslands and peatlands. Oceans absorb roughly a quarter of human-caused CO2 emissions each year. Protecting and expanding these natural systems โ through reforestation, soil management, and coastal wetland restoration โ is the most established form of carbon removal. The challenge is that natural systems are vulnerable to fires, droughts, and land-use changes that can release stored carbon back into the air.
Engineered Removal
Newer technologies aim to remove CO2 at larger scales with more permanence. Direct air capture uses chemical processes to filter CO2 from ambient air and store it underground. Enhanced weathering spreads crushed minerals that naturally react with CO2, accelerating a geological process. Biochar converts agricultural waste into a stable, carbon-rich charcoal that locks carbon in soil for centuries. These approaches are promising but currently expensive and small in scale.
The Gap Between Now and What Is Needed
Climate scientists estimate that the world needs to remove billions of tonnes of CO2 per year by mid-century. Current removal capacity is a tiny fraction of that. Scaling both natural and engineered solutions โ while continuing to cut emissions at the source โ is essential to meeting climate targets.