If you follow Heal the Bay on Twitter, you learn all sorts of interesting stuff, like news that a new species has been discovered off the coast of San Diego, or how fish farms affect the coast line, or thoughts about the greenest U.S. presidents.

Today's tip: how to shake the tree-killing Yellow Pages from your carbon footprint. Want more? Here's Mark Gold's excellent (and occasionally upsetting) blog, Spouting Off.

As for this photo, I shot it while visiting friends in Village Green, an amazing 68-acre oasis in the heart of the city. Click on this google map and select the satellite view and you'll get the picture.