23 Apr '11, 6am

There's a myth that it was easy to regulate ozone depleting chemicals because alternatives already existed. Not true:

This is one of the half-dozen major things that "everyone knows" about the stratospheric ozone case that are simply erroneous. As soon as CFCs came under suspicion in 1974, any competent chemist could, and many quickly did, figure out that there are a couple of dozen similar chemicals that would be plausible alternatives less destructive of ozone -- the 1, 2, and possibly 3-carbon HCFCs and HFCs. A few years of research allowed labs at DuPont, ICI, Allied, Atochem, and a couple of other CFC producers to verify that there were possible synthesis routes for these, and to do preliminary investigation of the thermodynamic and other properties that would determine their suitability for applications formerly served by CFCs (e.g., to identify the vapor-pressure curves for those that were not already established). DuPont issued a report in 1979 that said, more or less, that "these...

Full article: http://www.grist.org/pollution/2011-04-22-no-ozone-regula...

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Three easy steps to making your own bread

Three easy steps to making your own bread

chelseagreen.com 23 Apr '11, 3pm

Combine 4 cups unbleached, white flour, 1 teaspoon baking yeast, 2 teaspoons salt, and 1.5 cups water. Mush around in a bo...