Voice of America: Last week, the U.S. Global Climate Research Program released a report concluding that climate change is happening now and is already having a significant impact on the United States. Bill McKibben was one of the first voices to warn of climate change – two decades ago, in his 1989 book, The End of Nature. He is still speaking out. Bill McKibben is an environmentalist, writer, activist and scholar-in-residence at Middlebury College in VermontMcKibben was born in 1960 in Lexington, …