Urban greenspaces improve air quality, according to NPR. Scientists have recently discovered that rats living in ultra-hygenic environments, or ones with considerable air pollution, are more prone to develop allergies than rats in the wild.

Building rooftop gardens in urban environments will help us clean the air in our cities, reducing the incidence of illness. Reducing the amount of pollution coming from dirty power plants and industry by decentralization, EPA code enforcement, and solar and hydrogen power sources will also clean our environments. You can improve air quality standards by converting your car or truck, too! Or by telling Honda and other automakers to do it for you on a new car!

The world is waiting.