So far this year, CBS has covered global warming more than both of the other two newscasts put together. This time, CBS had a veritable green-rush. John Blackstone brought us the latest data on rising concentrations of carbon dioxide; Seth Doane showed us the choking coal pollution in northern China; and Chip Reid traveled to the scenic Penobscot River in Maine, where dams have been demolished and salmon are expected to run free once more.
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