Voice of America: This month’s UN Climate Change Conference in Copenhagen comes amid growing scientific consensus that global temperatures are rising, and that the warming trend is having a measurable impact on life on the planet. According to a 2007 UN intergovernmental panel report on climate change, 11 of the previous 12 years were the warmest on record. Although disagreements persist on the extent to which human activity is responsible for climate change, the Earth’s warming no longer appears in doubt, …