The social cost of carbon: Group of answer choices Is always estimated as zero, because climate change cannot cause damages Is estimated by economists, who always get it exactly right Is negative, because climate change will make us so much better off Is estimated by economists, but because some of the climate-change damages are not included in the economy, the real cost of releasing CO2 is probably lower than the estimates Is estimated by economists, but because some of the climate-change damages are not included in the economy, the real cost of releasing CO2 is probably higher than the estimate