The nation's capital hosted what was billed as the largest climate rally in U.S. history.
Dumping of drugs into water, flushing medicines down the toilet, or passing through people's bodies in an un-metabolized form are ways pharmaceuticals enter rivers and streams.
Prominent environmental and human rights leaders were arrested Wednesday outside the White House while protesting Keystone XL pipeline construction.
Many environmentalists are encouraged by the fact that Obama is now starting to discuss climate change more.
Farmworkers say Monsanto makes an exorbitant profit each year on royalties from "renewal" seed harvests.
Under proposals now before the European Union, three pesticides that harm bees and have contributed to their overall decline may be banned soon on that continent.
They focused on its implications, how the public perceives it, and the attempt by conservatives to deny its very existence.