Assertion: fission | /r/HasProperty | source
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Source sentences:
text: Supporters of nuclear energy argue that it is unwise to rely as heavily as we do on fossil fuel sources (oil, coal, natural gas), for four reasons: (1) supplies of these are limited (although estimating how much there is in the earth is not as reliable as we would like); (2) oil comes from politically unstable parts of the globe; (3) burning fossil fuels produces air pollution (toxic gases such as carbon monoxide and sulfur oxides); (4) global warming due to increased levels of carbon dioxide, is a consequence of burning fossil fuels, and nuclear fission is a source that does not produce CO 2 .