Over the last 150 years, 40% of the world's forests have been lost and over the last century more than 40 animal species have become extinct. Frequent and longer droughts increase ground-level ozone which damages crops. The average land and ocean temperatures have increased nearly 1.33°F in the last century. One coal-fired power plant in Colorado annually releases over 10,000 tons of smog and 5.4 million tons of carbon dioxide, making it the second largest greenhouse gas emitter in the state. It plans to convert to natural gas by 2022 under a state program. Transportation accounts for 23% of Colorado's CO2 emissions, which are growing the fastest, partly due to increased sprawl raising