The document argues that claims of catastrophic man-made global warming are unsupported and contradicted by evidence. It cites historical periods like the Roman Warm Period and Medieval Warm Period that were warmer than present without human CO2 emissions. It also notes recent record cold temperatures, growing ice sheets, and thriving polar bear populations that contradict assertions of imminent warming catastrophes. The document concludes that factors other than CO2 like natural climate variability and urban heat island effects best explain temperature changes.