Possibly my biggest worry is water - providing water for 1bn+ people (and agriculture, and industries) is going to get harder and harder. I'm a techno optimist, so I'm hoping some variant of desalination tech will pull through if things get really bad.
The other big worry as you say is the heat waves. If we do get emissions under control, I think we'll also end up doing some form of carbon scrubbing and don't just sit around in a 2C warmer world. None of our current climate engineering approaches are enough to arrest global warming by themselves but I'm hoping we can eventually control the amount of CO2 in the atmosphere.
No, they did not. Germany did and China profitted.
(although they have also brought online a shittonne of coal power, too)
China was the second mover profitting from proven technology and prices that were lowered for all players by subsidising not German companies, but the installation of solar power (no matter where it was from).
It looked like some of the dirtier industries are being moved on from China to SE Asia (Vietnam etc.) but there's a general push across the world to transition to clean energy.
I'm pretty confident we'll get out of the doom and gloom existential threat to humanity scenarios, but still think large portions of the world's populations will be impacted by climate change.
[1] https://www.theguardian.com/environment/2020/sep/27/china-ca....