@Leon
I just looked up the comments he made in favor of a carbon tax that you referenced and immediately found an article from 2009, so t was indeed a long time ago that he was advocating for such a policy. Both of my previous reasons for why he may have done this still stand.
If what you are saying is true, if it would replace the current cost inducing regulations and make it so the expenses of the firms do not go up, then that would be a completely different story. I still am not sure if I would support it, that would require a more in-depth analysis of it, but it would alleviate my concerns about it severely hampering the energy sector even more than it has already been.
@Ogion
I don't know whether a new electric car is cheaper than a new gas car, I would think not, but I''m not a car expert so I won't bother contesting that point. I can assure you though that a used gas car is cheaper than a new electric car and if you think the majority of people are out there buying new cars, you are mistaken. The average age of the typical person's car is 12 years old. It will take a while for those electric cars to become cheap enough on a used basis for them to be cost effective for the typical person.
In regards to producing electricity, you are simply wrong. Coal and gas are way cheaper than solar in terms of electricity generation. People keep trying to jump the gun on that, it's coming, but you have to be patient before you can make that claim, it hasn't happened yet.