Charles David Keeling's measurements provided the first significant evidence of increasing atmospheric carbon dioxide concentration in the atmosphere.
A new study highlights 180 regions in the U.S. where sea level rise is likely to have a major impact. Here are photos of the 20 cities with populations over 300,000 which are likely to be affected.
Present vs. projected August days over 95 degrees Fahrenheit
Present vs. projected August days over 90 degrees Fahrenheit
If current trends in burning coal and other fossil fuels continue, average temperatures in the U.S. are projected to increase by roughly 10Ã‚Â°F by 2100.
CO2 may be separated from other gases at coal-fired electric power plants and transported by pipeline to suitable storage sites.
The United States has many areas, shown in pink, where geological formations are likely to be suitable for long-term carbon dioxide storage.
The federal Renewable Fuel Standard encourages U.S. corn ethanol producers to boost production to 9 billion gallons by 2008 and 15 billion by 2015