Shell and EXON buying everyone in France an AC unit so everyone can keep driving cars around is one of the most dystopian ideas I have considered in some time.

It's not even to keep people driving cars. It's just the new normal. Even if we stopped driving today we're still going to bake Paris in the summer. The damage is already done. Think of it more like a fine for destroying the environment.

A more reasonable shortish term solution is to air condition large communal buildings and allow people to camp out overnight when the temperatures become inhospitable.

Why are cars relevant here? Weren't most of the people who died from this elderly anyway, less likely to be driving?

I think the most dystopian idea would be Exxon not paying for their crimes against humanity, but rather allowed to continue lying to the public about climate change, lobbying governments to reduce their penalties.

If you phrase it as "fossil fuel companies should pay large amounts in taxes and the government should use those taxes to help mitigate the effects of climate change" it changes from dystopian to socialism without missing a beat.