The alien presence on Earth is apparently comprised of beings that have evolved from insects and reptiles. While climate change is bad for the human race, it actually might be a good thing for these extraterrestrials, as insects and reptiles prefer hotter weather. Also, government is incapable of protecting you from extraterrestrials. 

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Link to United Nations article about climate change: What Is Climate Change? | United Nations

Link to Combat piece about insects: Combat Bugs | Warmer weather means more bugs

Link to Reptile Magazine article: Ideal Heating For Your Reptiles - Reptiles Magazine

Link to Physical Trace study by Ted Phillips: Physical Traces Associated With UFO Sightings - Ted Phillips | PDF (scribd.com)