Even more stuff we haven't started worrying about yet (and don't intend to)

You Need Phosphorous to Live—and We're Running Out | Mother Jones:

"The United States does have some phosphate reserves, the most heavily mined of which are in Florida. But phosphate mining is an environmentally devastating project—it requires stripping large swaths of land and generates massive amounts of a waste product called phosphogypsum, which contains low levels of radiation as well as a range of toxic heavy metals. In Florida, no one knows what to do with the stuff, so it has been sitting in huge piles in mining regions. "