claim: But observations, such as those on our CO2 Coalition website, show that increased CO2 levels over the next century will cause modest and beneficial warming—perhaps as much as one degree Celsius ( 1.8 degrees Fahrenheit )
evidence: Also, a report by the Royal Netherlands Institute for Sea Research stated that around three million years ago, levels of carbon dioxide in the Earth’s atmosphere were similar to today’s levels which increased temperature by two to three degrees Celsius and melted one third of Antarctica’s ice sheets.