meeting of congress. hillary clinton, democratic presidential front-runner, came out against the keystone xl pipeline. and china, the biggest polluter on the planet, announced it will adapt a cap and trade program to limit carbon emissions. today another stunning headline. shell announces it will stop its massively controversial bid to drill in the alaskan arctic, years-long endeavor costing $7 billion. that's billion with a b. shell says it ended exploration for the foreseeable future, citing not only those high costs but also admitting it just didn't find enough oil. the company also noting the unpredictable federal regulatory environment in offshore alaska. shell's decision to end its arctic exploration speaks not only to the shifting economics of fossil fuels in the era of climate change but also to the power of grassroots activism. controversy has followed the company's quest to drill in the arctic ever since the obama administration approved the project. that quest has been met with months of dramatic protests, from activists boarding one of