pollution

Plastic pollution in the ocean is almost exclusively due to the actions of Asia and Africa, not the United States. Banning straws and plastic bags will do nothing to solve the problem.
Air pollution in China has a substantially negative impact on public health. But with the exception of central and southern California and the upper Midwest, the United States has extremely clean air. And in fact, most regions in this country would not benefit from tighter air pollution standards.
The American Lung Association of California is claiming that a big push in the use of Zero Emission Vehicles would save Americans billions of dollars in health costs each year. What's more, the group adds that it would also save thousands of lives. Unfortunately, those are just wild promises and not much more.
The lead-laden water crisis in Flint, Michigan has been a slow-motion failure of government and public health oversight at multiple levels. Do demonstrate this, here's a timeline, along with commentary, on how it happened. Why it happened is another story entirely.
Yale University researchers analyzed groundwater from 64 wells in several fracking-dense Pennsylvania counties where Marcellus shale drilling is taking place. In the largest study of its kind they found no association between fracking and well water contamination.