The Amazon rainforest is the world’s large tropical rainforest, covering roughly 2.7 million square miles. It comprises more than half of the world’s remaining rainforests. It is crisscrossed by thousands of rivers, including the huge Amazon River, and is famed for its biodiversity. It is comparable in size to the United States and extends into nine South American countries. Most of it is in Brazil. Colombia contains only a small fraction of the Amazon rainforest – roughly 6% of it – but the rainforest there makes up 40% of the country.

The governor responded this week to Republicans' calling her proposal a political stunt, saying: "Clearly, these are not areas that tend to vote Democrat, where there's farms. Let's just put that out there.”

Until now, estimating how old a dinosaur was when it died has been a fairly simple process: Count up the growth rings in the fossilized bones. But new research into some of dinosaurs' living relatives, like crocodiles, suggests that this method may not always work.