[fr2null]

I'm not even anything close to a climate expert, but I can imagine that this is because most of the world lives in places that are livable in our current climate.

Most of us don't live in Siberia or Greenland. Sure these places might become great because of climate change, but it doesn't matter, since barely anyone lives there.

In the places were we do live, the temperatures are already (semi) ok, meaning that increasing these temperatures will bother more people than it will help.

Furthermore, most people live close to water, which means a rising sea level will be bad for them. Maybe (probably not, but just imagine that) after the sea level has risen we have more viable land that is close to water. However, at that point all the current cities have been ruined by it, because they were built for the old water levels.