Climate change, ozone depletion, and ultraviolet radiation
Concerns about climate change stem from the increasing concentration of greenhouse gases in the atmosphere. These gases keep heat from dissipating into space. According to the Intergovernmental Panel on Climate Change (IPCC), a continued increase at current rates could raise the average global air temperature between 1 and 3.5°C by 2100. The average rate of warming would likely be greater than any seen in the past 10 000 years.
11 Aug 2014