U.S. CO2 emissions have fallen to early 1990s levels, someth aspwv1970-01-01T00:00:00-05:00January 1st, 1970|Twitter| U.S. CO2 emissions have fallen to early 1990s levels, something that “never would have happened without a combinati… https://t.co/Zr4u8XCItT Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkEmail