Picture a giant, invisible sponge silently working to absorb the CO₂ we pump into the atmosphere every day.

That’s exactly what a carbon sink does.

Forests, oceans, and soils act as Earth’s natural climate regulators, absorbing roughly half of all human-generated CO₂ emissions—keeping global warming from spiraling out of control.

But here’s the catch: not all carbon sinks are created equal, and some are now failing. The very systems we rely on to keep our climate stable are showing cracks, and the consequences could be catastrophic.

So, what exactly are these carbon sinks, how do they work, and why is their decline making headlines?