Coffee is one of the most popular drinks in the U.S., which makes for a perky population -- but it also creates a lot of used grounds.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/coffee-infused-foam-removes-lead-contaminated-water
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/science-daily
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution-control
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lead
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/heavy-metals
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-quality