I'm assuming that most people answering this are from the US, where scientific iliteracy is higher than in other 1st world countries.
Normal people from other 1st world countries cringe at Americans denying human's involvement in climate change, as if there are not tons of existing regions already destroyed by human activity, such as the Aral sea (Kazakhstan), the Salton Sea (California), the Bikini Atol (Marshall Islands)...
What they don't seem to understand is that Earth will continue existing, with or without humans. We are basically making our existence more complicated.
If we f*** it up enough, bacterias and other microbes will surely live on, no worries, there have been mass extinctions before.
All in all, even planet Earth will cease to exist at some point, when the sun destroys Earth in 3 or 4 billion years.
So anyway, what some of us are afraid is that we humans make it too complicated for humans to live in... in our lifetime, which seems to be more and more feasible.
A shame for people with children right now: they will get to see how their children and grandchildren will have a really dark and scary future ahead, that's for sure.