One Kilometer Wide

The size of the tornado that hit Greensberg in Kansas. People said their ears started popping. Looks like the future will call for pressurized bunkers in the basement - where the pressure can be regulated. How come history doesn't recount any such calamities. I've heard that tsunamis in prehistoric times were a thousand feet high - compare with a 100 feet today. I guess once the core of the earth cooled down, things cooled down with it. As for tornadoes, how about erecting solid steel structures that can foil it - the steel structures are, say, 2'x2' and hundreds of feet tall and they'll be raised from the ground at regular intervals to slow down the high speed winds and prevent damage at ground level.