Global warming is real according to the facts presented in the document. Decreased snow cover and rising sea levels provide evidence that the planet is warming. Additionally, the US fire season has increased by 78 days in the last 20 years due to higher temperatures and earlier snowmelt. While Americans make up only 5% of the world's population, the US is responsible for 20% of global CO2 emissions. Global warming poses risks to national security by potentially increasing natural disasters that require military response.