Recently, an emissions bill before Congress died a legistative death. While said bill may not have had the emissions targets many wanted, it was important for obvious reasons. Whether or not it was effective is now moot.
You can watch the US Senate Debate on DotEarth.
Other countries are playing hardball. Japan recently announced its plans to slash 80% of all carbon emissions by 2050, vowing to usher in a "low-carbon revolution." Read about it here (AP), here (BBC), here (Reuters UK), and read of its far-reaching economic and environmental implications here (The Australian).