Charles D. Keeling, 77, Who Raised Global Warming Issue, Dies - New York Times
Dr. Charles D. Keeling, who set off current concerns of global warming through measurements beginning in the 1950's that showed steadily rising amounts of carbon dioxide in the air, died Monday at his home in Montana. He was 77.
The cause was a heart attack after a short hike, said the Scripps Institution of Oceanography in San Diego, where Dr. Keeling had long worked.
This is one of the coolest graphics ever. The trend indicates the increase of atmospheric carbon dioxide on an isolated mountaintop in Hawaii, the variation shows the annual cycle of plant growth and death. Because it's an isolated location, this is a pretty good measure of global trends, or at least hemispheric trends.