It hasn't made a dent /yet/ but one of the key causes of climate change is that these billionaires were able to become so by taking advantage of a great big ext

It hasn't made a dent /yet/ but one of the key causes of climate change is that these billionaires were able to become so by taking advantage of a great big externality - dumping waste into the environment. If the price for (say) carbon had been properly baked into the cost of gasoline, there would have been significantly less fat to skim off the top and we'd have vastly fewer resources and energy billionaires. That is: yes, it's great that cheap energy has lifted billions out of poverty and afforded them the lifestyle they have today. But now those billions are going to be the ones that have to pick up the tab while also being the most exposed to the dangers.