The Last Ice Age

The global temperature during the last ice age dropped by less than ten degrees fahrenheit. Ice domes covered large swaths of europe, and we had woolly mammoths and giant deer wandering around britannia. Around 40 thousand years ago, neanderthals started to arrive in briton,. And around 30 thousands years ago, modern humans followed them. It turns out that there was a cold snap about 22 Thousand years ago, and britanna became a treeless tundra for thousands of years.