Before we started burning fossil fuels, the carbon content of the air generally remained steady, but that carbon was still mobile. It was introduced into the atmosphere by natural processes, and absorbed into the land b

First Page		Document Content
Date: 2016-02-02 11:58:45		Before we started burning fossil fuels, the carbon content of the air generally remained steady, but that carbon was still mobile. It was introduced into the atmosphere by natural processes, and absorbed into the land b Add to Reading List Source URL: www.sagestep.org Download Document from Source Website File Size: 2,62 MB Share Document on Facebook