Associated Press: Senate climate bill calls for a 20 percent cut in greenhouse gases by 2020, deeper than the reductions mandated by the House but also includes stronger measures to try to avoid energy price spikes, according to a draft of the bill. The draft obtained by The Associated Press, remains subject to change. But the overall carbon reduction requirements are expected to stand. The Democratic bill is to be released Wednesday by the Senate Environment and Public Works Committee with a vote by …