Ashbrook asks, if the market were the answer and not a carbon tax, then why aren't we seeing anything from the market? And that is the issue, we could have said the same thing about mail and parcel delivery before email and UPS, and who saw google, Wikipedia, and Netflix on the horizon? The hybrid cars, wind farms, and solar seem like obvious solutions that the government has poured lots of money into. But the market's solution will not be so blatant and obvious as a government tax or subsidy, and Ashbrook's question will never have an obvious answer. Modern hybrid corn with no subsidy or tax for instance has done more to combat climate change than hybrid cars in the US.