President Barack Obama claimed progress Wednesday in his second-term drive to combat climate change but said more must be done to address a generational problem. One year after unveiling an aggressive plan, Obama said new【C1】______limits on power plants, renewable energy projects and new【C2】______for green technology have cleared the way for further action in the U.S. and abroad, despite steadfast【C3】______from much of Congress. "When you take those first steps, even if they"re【C4】______, and even if there are politics sometimes, you start【C5】______momentum and you start mobilizing larger and larger communities," Obama said. Obama"s【C6】______served as a progress report for his climate plan, which the president【C7】______out last June. Twelve months later, much of the plan is in【C8】______although the most ambitious steps are still up in the air and will take years to be【C9】______realized. Change won"t be instantaneous, Obama【C10】______. "There"s no silver bullet." Indeed, many of the steps he"s taking are【C11】______, limited in scope by hostility from both parties to putting a【C12】______on carbon pollution, which would require new laws from Congress. Still, Obama said he"s seeking to【C13】______the problem but cutting it up into smaller pieces. "We"re moving, and it"s making a【C14】______," he told a supportive crowd at the League of Conservation Voter"s annual dinner. The environmental group【C15】______Obama early in his 2008 campaign.【C16】______on the international front, momentum has been obscure.【C17】______global climate talks next year in Paris, there are fresh【C18】______that some countries are urging others to resist【C19】______moves to curb carbon. That could discourage even bigger polluters from【C20】______. 【C4】

A. convenient
B. hard
C. devastating
D. coherent