“Our house is on fire.” Teenage climate activist and global inspiration Greta Thunberg used these words in an electrifying speech at the World Economic Forum in Davos. She was furious at the failure of the world’s richest, most powerful people to act on climate change. The vast majority of scientists agree that global warming has reached crisis point. If humankind doesn’t act now to repair decades of exploitation and pollution of the planet, there may soon be no planet left at all.