NEW ProCon.org Website! – Is human activity a substantial cause of global climate change? – Over the 20th century the earth warmed 1-1.4°F and climate changes including more intense heat waves, stronger hurricanes, loss of sea ice, glacier retreat, and more droughts have occurred. As of Apr. 2010, levels of the greenhouse gas CO2 were 389 parts per million – allegedly higher than at any time in the last 650,000 years.
Some people argue that rising levels of human-produced greenhouse gases are warming the planet and causing the climate to change. Others argue that reported greenhouse gas increases are too small to change the climate, and that 20th century warming has been the result of natural processes such as fluctuations in the sun’s heat and ocean currents. ProCon.org’s newest and 34th website explores the pros and cons in this debate.