If you’ve booked a flight recently, you might have been offered the chance to cancel out your journey’s carbon emissions, just by clicking a box.
Carbon offsetting, as it’s known, is often touted as a business-friendly way to tackle future climate disasters.
It means that rather than simply reducing emissions, polluting companies can pay them to be reduced somewhere else.
But analysis by Channel 4 News raises new questions about whether this multi-billion pound market is actually delivering the benefits it claims.