In their What If? video series (previously at Neatorama), Randall Munroe of XKCD and Henry Reich of MinutePhysics look into wild theoretical questions from fans, no matter how stupid they are. Now, we know that the earth rotates 360° every day. But this question is about rotating it in a different direction, sideways to be exact, changing its orientation completely. To see what would happen, they theoretically made the Greenwich Meridian into the equator. That changes everything, especially the way we see the globe. London is suddenly in the tropics, and India is where Siberia used to be. Antarctica would be a much smaller island without its ice cap. Some places, like where I live, wouldn't change its climate or weather too much, we'd just be in a different hemisphere. If this change were to happen gradually, the earth would adapt, but it it were sudden, it could be a mass extinction event.
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