If we want to cool the Earth then lets get rid of black roads. Use cement. This will reflect heat and the cement will need less repair. Make roofing with a white or neutral coloring.  Lay white biodegradable white sheets on the Artic waters.
Over all pilots beware. 
Mechanically stopping the Hurricane in the Gulf. On a huge scale! Build Portable Powerful Deep Water Floating Pumps. Place these pumps in direct line of travel of the hurricane. Pump cold water to the surface robbing the energy of the on coming storm. Retrieve them afterwards. In the gulf. In the Atlantic. Anywhere.

Mechanically stopping the tornado: Now this is crazy lol. Build large springs to be wound by the wind creating friction. Attract the tornado as a large grounding rod. Release an frozen inert gas to cool the air.
Secret is Being Positive