Yale Environment 360: Rapidly rising levels of greenhouse gases are already having a major impact on the earths natural systems and the problem is likely to grow significantly worse unless these emissions are brought under control, according to a new report by the Intergovernmental Panel on Climate Change (IPCC). The report, released in Yokohama, Japan, said that steadily rising temperatures are melting polar ice caps, sharply diminishing Arctic sea ice, intensifying heat waves and heavy rains, causing the death of coral...