Rainy season, Brazilian Amazon, 2014. Canoeing through a flooded rainforest brings the traveller up close and personal with monkeys, sloths and other creatures that usually spy unseen from their remote green watchtowers. And the swifter travel through swathes of forest barely accessible on foot makes the jungle feel endless. Yet WWF estimates that over a quarter of the Amazon will have been deforested by 2030. On World Rainforest Day we are reminded why this matters: rainforests regulate the world’s climate and purify the air; they house 50 million indigenous people; they provide 25% of all medicines; and they hold 50% of all biodiversity on earth.