Climate Central: Landmarks are generally thought of as tangible, physical things, usually involving plaques and lots of marble. But a newly named landmark recognizes something more amorphous: the steady rise of carbon dioxide in the atmosphere that envelops the planet and that is steadily heating the globe.
The American Chemical Society has named the graph that charts that rise -- called the Keeling Curve, so named after the scientist who began the CO2 measurements -- as a National Historic Chemical Landmark....