Reuters: A "historic" Bali deal. A "Berlin Wall" dividing rich and poor nations on global warming policy falls. A "new chapter" for Washington after six years of climate disputes with many of its allies. And now comes the hard part. After all the praise for the agreement hammered out at the 190-nation Bali meeting to work out a long-term climate treaty involving all nations by late 2009, governments will have to work out the details. "We will …