Dealing with climate change will cost money. The article is suggesting that if climate change activists want to be successful, they need to acknowledge that and

Dealing with climate change will cost money. The article is suggesting that if climate change activists want to be successful, they need to acknowledge that and start talking about cost-benefit trade-offs. The argument is, explicitly, that this is a precondition for effective political activism. If you don't want to do that, and if you want to kid yourself that transitioning to a carbon-free economy can be done without spending money, fine, but there's no need to misrepresent the original argument.