Part 141 (1/2)

252 princ.i.p.al source of human-caused mercury in the environment

U.S. Environmental Protection Agency, ”Mercury: Basic Information,” February 7, 2012, /publications/weo-2011/.

257 the CO2 emissions would continue destroying the Earth's ecosystem

Kurt Kleiner, ”Coal to Gas: Part of a Low-Emissions Future?,” Nature, February 28, 2008.

258 70 to 75 percent of the carbon in coal for each unit of energy produced

U.S. Environmental Protection Agency, ”Air Emissions,” December 2007.

259 more expensive to produce and carry even harsher impacts for the environment

Bryan Walsh, ”There Will Be Oil and That's the Problem,” Time, March 29, 2012.

260 three quarters of the amount in the atmosphere

Rattan Lal, ”Carbon Sequestration,” Philosophical Transactions of the Royal Society B, February 2008.

261 his successor has made policy changes that are reversing

Jeffrey T. Lewis, ”Pace of Deforestation in Brazil's Amazon Falls,” Wall Street Journal, November 28, 2012.

262 dramatic ”dieback” of the Amazon at mid-century

Justin Gillis, ”The Amazon Dieback Scenario,” New York Times, Green blog, October 7, 2011.