• Big news: EPA announces plans to begin carbon regulation. Read David Doniger's response on Switchboard. He'll host a live chat about the announcement on Switchboard this Monday at 1 pm. Post your questions here.
• Obama outlines plans for high-speed rail network. NRDC Executive Director Peter Lehner wrote about the announcement on a train ride back from Washington yesterday.  
• Follow the amazing Margo Pellegrino as she paddles 1,000 miles in an outrigger canoe to help Save Our Seas. She's blogging about her journey on NRDC's Greenlight; see photos from the trip here.
• David de Rothschild prepares to set sail on a plastic ship to visit the Great Pacific Garbage Patch.
• Planet Green says unplug your gadgets and you'll save up to $270 a year.
• Texas is the top wind energy-producing state. Energy infrastructure for wind power has grown in Minnesota and Iowa.
• Tune into PBS Frontline on April 21 to watch Poisoned Waters, a documentary about great waterways that are threatened by industrial pollution.
• The Center for Disease Control and Prevention withheld evidence that contaminated tap water caused lead poisoning in kids.
• Detroit's mayor wants to use stimulus funds to demolish the city's Michigan Central Station, which has been on the National Register of Historic Places since 1975.
• Biodegradable PeePoo bag could bring sanitation improvements to the developing world.
• A giant pod of dolphins saves Chinese ship from Somali pirates.
• Santa Monica residents are turning backyards into community gardens.
• Antarctic Wilkins ice shelf breaks away.
• Fifty of the country's most hazardous and polluted sites will receive federal stimulus money for clean-up efforts.
• Toronto considers mandating green roofs; City Council will vote on bylaw next month.

Think I missed anything really great? Feel free to share it in the comments section. Want news updates every day? Check out my colleague Ben Jervey's blog on Greenlight.