Google gets it:

Putting a price on carbon can help level the playing field, but to actually deploy renewables to the extent that we stop burning coal, I believe that’s only going to happen if they can compete economically without any substantial price on carbon or substantial subsidies, because I don’t think that people will tolerate that. I hope they will; I would be willing to pay that extra cost, but I can afford it. There are lots of people in the developing world who probably would say, I’m not going to pay that.

So that’s why we took as our direct goal that we’re aiming for, let’s make renewables cheaper than coal, and let’s make that happen as quickly as we can.