What would happen to the earth if humans disappeared?

If humans just disappeared than a lot of catastrophes will happen in the first couple of years because the deadly gasses will spread through the world killing all animals that breath in the air enough. Also all the cars, and planes would crash and fire would spread everywhere. And, the power plants would stop leading to major blackouts. The nuclear power plants would explode because the nuclear liquids would turn into gasses in the warm weather outside, causing the containers to no longer be able to hold the gas.