Science: The political war over climate science is flaring up again on Capitol Hill this week as the U.S. Senate debates a bill that would approve the highly controversial Keystone XL pipeline. Pipeline opponents, many of whom oppose the project because they say it would accelerate climate change, are trying to secure votes on a number of largely symbolic amendments affirming the Senates belief that climate change is real and human-caused and that policymakers should address it.
The pipeline opponents,...