Thought you would be interested in reading it. We are told by a staffer that this measure was passed by Congress in 1995 as part of the Contract With America. Nobody knows it, however. Perhaps it is time to get the word out. But their study of levels over the last 60 million years suggests that the gas was once even more abundant than it is today.
Carbon dioxide is the main gas caused by human activity that has been linked to global warming.
Some claim that by 2030 the total climatic impact of rising levels of all greenhouse gases will be equal to that caused by the doubling of pre-industrial CO2 concentrations. By 2100, the effect would be trebled. They used a new technique to establish CO2 levels in the ancient atmosphere, analyzing the shells of planktonic organisms that once lived near the surface of the ocean. This enabled them to establish past seawater acidity, which in turn was dictated by the amount of atmospheric CO2. The researchers estimate that between about 60 and 52 million years ago, CO2 concentrations reached more than 2,000 ppm.