The carbon cycle is more dangerous than an asteroid.

An asteroid killed the dinosaurs but unstable carbon cycles caused the worse mass extinctions in earth’s history—and we are putting carbon dioxide into the air at a rate the earth has never seen before.

I’m joined by science journalist Peter Brannen, author of The Ends of the World, to discuss how the carbon cycle has caused five out of the six mass extinction events — with the worst taking 10 million years for the planet to recover. Peter says all the drivers point that we are hurtling towards a sixth mass extinction if we don’t change rapidly change course, an event totally unprecedented in its man-made nature. This is an experiment in planetary systems going horribly wrong. We still have time to stop. If we don’t, the results could change the planet beyond recognition.

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