claim: The Petition Project features over 31,000 scientists signing the petition stating there is no convincing scientific evidence that human release of carbon dioxide will, in the forseeable future, cause catastrophic heating of the Earth's atmosphere.
evidence: Human activities, primarily the burning of fossil fuels ( coal, oil, and natural gas ), and secondarily the clearing of land, have increased the concentration of carbon dioxide, methane, and other heat-trapping ( greenhouse ) gases in the atmosphere...There is international scientific consensus that most of the warming observed over the last 50 years is attributable to human activities.