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Content: Timeframes of many thousands of years. However, sometimes climate changes too quickly for animals to adapt—in which case those that are better suited to the new conditions survive, and others go extinct. The most dramatic abrupt climate changeof the last 100 million years was the one caused by the Chicxulub asteroid strike around 66 million years ago. The effects lasted long enough to qualify as climate change—centuries in fact, and complete recovery from the strike took 3 million years. No animal larger than a medium-sized dog survived, on land or in the ocean. The current human-caused climate change is a far cry from that 6 mile-wide asteroid hitting Earth at 40 times the speed of sound, but it has one thing in common: it’s happening faster than animals can evolve to adapt to it. So from an evolutionary viewpoint, human-caused climate change is also “abrupt.” One of the more obvious consquences is clmate zones climbing mountains. Around the planet you have species of animals adapted to specific climates, and as you go up mountains, you’ll see successions of species corresponding to more and more northern climates on flat land.