[footfootfoot]

I think about the crust of the earth as being similar to the top of brownies when they come out of the oven. As they cool the crust hardens first and as the inner part cools and shrinks it creates cracks in the crust.

Now imagine an earth sized brownie. A few degrees of temperature change (i.e. global warming) you are going to have crust movement. I expect we'll see a lot more earthquakes in the coming years, along with the other extreme weather events, flooding, with a slight chance of locusts.