It won't matter when the oceans and the permafrost release their methane because humanity will die, the Earth will continue for a few billion years, possibly with some life forms. Rest peacefully knowing most cockroaches will go with us having linked their existence so tightly to ours.

Global Warming is not that hard to understand. We teach it at school and I think we do a reasonable job. At least in my experience YMMV. I suspect that the people who refute Global Warming don't do so because they fail to understand it, but because they are fooled by erroneous counter arguments. What I think we should do, is to teach Critical Thinking to allow people to defend themselves against attractive falsehoods.

Let me get this straight. You're saying if I keep driving my car the tropical belt will expand pushing the subtropical belt outward pushing the temperate zones outward and removing the arctic regions. Which in turn increases evaporation and the humidity in the air. All of which is good for plants and animals eat plants. So you want me to stop driving my car because you hate animals or plants?

I suggest anyone who believes global warming is caused by human active should read "Climate, the whole story". Written by the former head of the archaecology department of the university of Washington. It's a good read,the author just gives you the facts and allows the reader to reach their own conclusion.

Ok volcanoes aren’t the primary cause but it’s been theorized that if certain volcanoes that tend to release something sizable amounts of sulfur dioxide were to be made to erupt that we would at least buy ourselves more time to get the rest under control.
Just saying there’s an option that’s been explored but no one wants to risk a few thousand to save a few billion.