Globe and Mail: In coming weeks, more than a thousand small, yellow cards will traverse the waters around Vancouver and the Gulf and San Juan islands, washing up along the shores of the Salish Sea. Those who stop to pick them up will see a simple message: "This could be oil."
The cards are part of an oil-spill study launched Thursday by members of the Raincoast Conservation Foundation and the Georgia Strait Alliance.
By dropping hundreds of the small pieces of bright yellow marine plywood from boats into...