But scientist "consensus" is good enough to upend the world economy even though it is not a given that anything can be done about GW, man made or not?
It is a fallacy that measures which could be taken to reduce the impact of global warming would necessarily "upend" the world economy. Given the potential that global warming has to impact the world economy, not doing anything could be a worse course of action than effective (and feasible) energy efficiency, alternate sources, and resource conservation tactics.