Heatwaves, deluges, rising seas: climate change isn't a future scenario but one that we're living in now.

How much worse might it get? That all depends on what happens over the next few decades – or even in the next one.

Best case scenario

The best case scenario is that the world succeeds in ramping down man-made emissions of carbon dioxide, within this century, to net zero.

Emissions might even have to be forced down to negative toward the end of the century, something that would likely require CO2 to be actively sucked back out of the atmosphere.

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Mean global

The worst case scenario

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What needs to happen now