From our point of view it "matters" bc we don't want to die. If climate change leads to ice-free poles we will see a different map and a lot of people will lose their places where they lived. But what is the difference when this happens due to higher volcanic activity and therefore more of the greenhouse gases in the atmosphere? Even if we lived "forever" once the sun dies in 4 billion years or so life will finally die on this planet bc earth will most likely be grilled.
One of my worries is that humanity might undergo an anti-technology backlash and miss its chance to colonize space, which in turn would miss its chance to save the world as the sun grows warmer.
The sun is getting warmer, and only humans can save the earth from overheating. If the sun is 30% warmer now than it was in the early solar system, that means that we should be 15% farther from the sun, so we should be about 22.5 million km, or 22.5 billion m, further from the sun now than we were 4.5 billion years ago. That's just a rough calculation, but it comes out as a nice, round 5 m per year that we should be moving the earth to maintain its place in the habitable zone. So one way is humanity nudges an asteroid into an orbit near Jupiter at aphelion and the earth at perihelion the earth (that uses the equivalent of the gravitational boost that we give to spacecraft) to steal momentum from Jupiter and transfer it to earth. Of course this is a bit risky because if we screw up the orbital mechanics, then we could hit the earth, so it's a question as to whether to use one large asteroid or multiple small asteroids.
I foresee humanity colonizing the astroid belt which I've written about in more detail on this forum. Beyond that, humanity will have merged with ageless machines when it leaves the solar system.
Super volcanos cause nuclear winter.
*the sun is expected to become a red giant in ~5 billion years. Not 4 million. Just saying.