NBC: Pollution and climate change due to human influence is clear, and the observed effects are unprecedented, according to a report released Sunday by a United Nations panel.
The 116-page report is the fifth since 1990 prepared by the Intergovernmental Panel on Climate Change (IPCC). The latest installment synthesizes the findings of the previous four reports and presents new conclusions that environmental scientists arrived at since the fourth report was released in 2007.
Economic and population...