How about March 17, 2001?
From the current issue of Science News, Vol 159, page 165. (Not online, except for the first para; my hubby subscribes. I won't type out the whole article. Here are excerpts.)
"Comparisons of data obtained from satellites that orbited Earth more than 25 years apart provide rare, direct evidence that the planet's greenhouse effect increased significantly during the closing decades of the 20th century. These new findings support abundant indirect indications that green house gases, such as carbon dioxide and methane, are warming Earth's atmosphere.
...indicates that the planet's natural cooling mechanism has lost some of its effect, says...atmospheric physicist...
...This is the first time that satellite measurements have been available to make this type of comparison,"...
...most of the increased heat-trapping effects of the atmosphere... occurred at wavelengths of radiation that correspond to absorbtion by carbon dioxide, methane, and other greenhouse gasses, such as ozone and...
Normal seasonal variations in atmospheric concentrations of green house gases, such as natural summertime [etc] are too small to account for many of the differences between the two sets of satellite data...." |
