RedOrbit: A new federally-mandated report released on Tuesday has provided more evidence supporting the idea that global warming is indeed happening and that human activity is the cause.
Multiple lines of independent evidence confirm that human activities are the primary cause of the global warming of the past 50 years, the report said. The burning of coal, oil, and gas, and clearing of forests have increased the concentration of carbon dioxide in the atmosphere by more than 40 percent since the Industrial...