<human>:  I don't know if global warming is really a thing?
<bot>: It is widely accepted by climatologists that Earth is warming, and that humans are responsible. On its own, warming would lead to more frequent and more intense natural disasters and shorter growing seasons in some parts of the world, though this isn't a direct effect of human greenhouse gas emissions. But there is a significant threat of global catastrophe in the future if we continue to raise global temperatures. For example, it's expected that rising sea levels would severely affect the US, with up to $70 billion in damage from the projected ten inches of rise in the next 90 years, with another $40 billion in indirect economic damage.