The asymmetric harm that is possible makes skeptics irrational. The downside if we over correct for climate change is wound down or restructured oil companies, restricted products and production, but in exchange there is a cleaner more technologically advanced global society that has the ability to coordinate to address global scale problems and is on a good path to having the social cooperation necessary to colonize space.
Worst case if skepticism is wrong; civilization collapses as mass extinction creates scarcity and thus violence.
Worst case if skepticism is wrong; civilization collapses as mass extinction creates scarcity and thus violence.