Greedly proposes that Dr. Blight's computer, MAL, sends him and rigger back in time to the 1950's to burn oil, gas, and coal. MAL then describes the greenhouse effect and global warming in detail.
This beginning scene of Wall-E depicts a post-acopalyptic Earth. The Earth has an enormous amount of environmental pollution and trash. There is little life in sight besides Wall-E and a cockroach.
After visiting Professor Marvel, Dorothy runs back home and finds that a tornado is threatening her house and family. Dorothy returns home and cannot enter the cellar because the barn keepers and her family have locked it. She enters the house, and is knocked unconscious by a shutter that comes loose off of a window in her room. This clip depicts the typical characteristics of a tornado.