Earth News: Climate Change Observations
Jan 02, 2007
Carbon dioxide emission from the burning of fossil fuels will produce a 3 percent reduction in the density of Earth's outermost atmosphere by 2017. "We're seeing climate change manifest itself in the upper as well as lower atmosphere. This shows the far-ranging impacts of greenhouse gas emissions." Recent observations by scientists tracking satellite orbits have shown that the thermosphere, which begins about 60 miles above Earth and extends up to 400 miles, is beginning to become less dense.