https://www.wired.com/story/microplastic-san-francisco-bay/

San Francisco Bay, like Monterey Bay to its south, is a rare success story in ocean conservation. In the 1960s, three grassroots activists—Sylvia McLaughlin, Kay Kerr, and Esther Gulick—launched Save the Bay, which beat back developers trying to fill in parts of the iconic body of water.

But also like Monterey Bay, San Francisco Bay has all the while been poisoned by an invisible menace—microplastic. Yesterday at a summit in Berkeley on the east shore of the Bay, the San Francisco Estuary Institute and the 5 Gyres Institute presented findings from a three-year survey of microplastics in Silicon Valley’s massive watershed.