According to them the free market solution already exists, but it's all about making some kind of correct consumer decisions. It's all about your actions as an individual consumer rather than any sort of society wide change in resource distribution. The solutions to them are like buy organic fruits, buy an electric car, buy the products from the corporations who change their logo to a green one. It's all about you personally buying stuff. And if the environment collapses? Well that's because you didn't purchase the correct products you complete imbecile. Your fault.