Carbon dioxide in air is considered to be a greenhouse gas because of its ability to absorb infrared light.. The concentration of CO 2 in the Earth's atmosphere has been increasing at a noticeable rate for much of the past century, There is much interest and concern over the inter-relationship between the levels of carbon dioxide in air and the subject of global warming,
Apr 07, 2015 · Most bioethanol is produced from sugar cane and maize, using yeast. Fermenters are used to keep the yeast in optimum conditions. When yeast carry out anaerobic respiration the sugars in the plant material are converted to ethanol and carbon dioxide. Starch and cellulose in the plant material are broken down by enzymes into sugars.