Washington Post: The six “Principles for Global Warming Legislation” released recently by Sen. Barbara Boxer were notable for what they lacked. There were no specific greenhouse gas emissions targets. There was no determination on an auction of pollution permits vs. giving some or most of them away to polluters initially. But the California Democrat was clear on one thing: There will be no consideration of a carbon tax. Sure, the chairman of the Environment and Public Works Committee said, “We’re …