Much of Texas routinely hits 40-43°C highs for months at a time every summer, and has for decades. Las Vegas and Phoenix are even worse. You're right, it is unbearable to be outside. The solution is AC and not going outside in the summer, or choosing to move and live somewhere cooler.

There is no such thing as a right to a comfortable outdoor temperature in the geographic environment of your choice.

This was true even before we started burning coal, it's true now, and it will still be true even after we hit net zero carbon emissions, and even after all of the CO2 dissipates.