Scientific American: President Obama’s top climate diplomat acknowledged today that Capitol Hill delays over global warming legislation will likely push international negotiations to work beyond a December summit in Copenhagen on a new treaty to succeed the Kyoto Protocol. “I think that we’ll shape the thing to get as much done as can be done, and there are some pieces that need to get completed,” Todd Stern, the State Department’s climate envoy, told reporters. “But I think the mission is to get the most …