False. It would be the poorest people who would be affected. Those living in high storm areas, such as tornados that destroy property or heavy rain areas causing landslides, these people without the funds to relocate would be most vunerable to climate change.
In case of emergencies such as natural disaster or security breaches, the president of the United States have the constitutional right to make a sole decision on dealing wir with it.
For a comet that has a very concentric orbit which brings it quite close to the sun and is at a distance of the AU of one thus making it around one year to orbit and would spend its time mostly in the beyond the orbit of the earth. As bodies that are closer to the sun move faster