Earlier quoted context omitted.
Middle? We're just starting . The air conditioning technology didn't hit its wall of fire yet. What we're going to do when that tech will cease to cool us? Every AC system (from refrigerators to air conditioners) has an upper limit, which is around 41 degrees Celsius for T1 class.
> What we're going to do when that tech will cease to cool us? Move. This is already happening, with water shortages forcing people to move. Climate change will (likely) cause famines and many deaths, but the bigger effect will be mass migration.
Another planet? How?
We assume that we will have a planet to live at the end of the day. I'm not so sure about it for the long run.