What if the Earth spun sideways on its axis

The Earth spins on a 23.5-degree tilt, which causes the seasons. But if the planet tilted more, all the way to 90 degrees, it would throw the world into chaos. The Northern Hemisphere would experience a six-month-long winter that would devastate the ecosystem and destroy crops. After that, a six-month-long summer that would melt the ice caps, raise sea levels, and flood coastal cities.