“Reading World on the Edge brings topics ranging from crop failures to state failures together in a way that no series of blog posts could…Brown draws these connections with both scientific rigor and the patience of a committed teacher.” —Jeff McIntire-Strasburg, Sustainablog.org. Follow us on:. Carbon dioxide emissions from burning fossil fuels in the United States peaked at more than 1.6 billion tons of carbon in 2007. Since then they have fallen 11 percent, dropping to over 1.4 billion ton...