Environment The Warming Debate
We know two things about global warming. One: in the last 100 years the average temperature has risen between two-thirds and one degree Fahrenheit. Two: in the same time the amount of carbon dioxide and other heat-trapping gases in the atmosphere has risen about 40 percent. That may not seem like a lot–Halsted is often that much warmer than the lakefront–but remember it’s an average, and the average temperature during the most recent ice age was only nine degrees cooler than today....