Large scale impact doesn’t automatically imply net positive or negative impact. Less pollution in 2020 will have positive health effects for decades to come vs

Large scale impact doesn’t automatically imply net positive or negative impact. Less pollution in 2020 will have positive health effects for decades to come vs significant economic harm which is where the uncertainty comes in. If we don’t know if the impacts are positive or negative we must default to looking at the net effect we can measure and add error bars around it for the things we can’t calculate.