Require automobile smog checks in all of the United States.

Smogs checks on automobiles should be required throughout the United States, as they prove to be an important stepping stone to sustainability in the U.S. Car fumes are not only bad for the environment, but can also be toxic to humans. The idea that all emission emitting vehicles must pass certain requirements before they are road ready, addresses the issue of climate change.
The whole world is currently facing these challenges, and unless changes are made, we will never accomplish what we have set out to do.
Environmental adaptations are inevitable, and the sooner changes are made, the brighter the future will be.