Lessons > Managing Resources > Introduction
Before the industrial revolution, the world's atmospheric CO2 levels were below 280 parts per million (ppm). Levels have now risen over 400 ppm. In order to limit the worst effects of climate change, many scientists believe we must keep peak atmospheric CO2 to no more than double the pre–industrial concentration, or about 550 ppm. Different political, economic, and ecological factions have varying ideas about which energy sources would be most efficient, cost effective, and least harmful to the environment. Using this simulator, you'll try to find the best mix of energy sources in order to keep the total atmospheric CO2 under 550 ppm.