QUESTION 28 If the abatement cost function becomes very steep, what does that mean for optimal temperature increases in a world of climate change? Optimal temperature increase should be lower Optimal temperature increase should be higher because the marginal damages are now less than the abatement cost Optimal temperature should remain the same if damages are unchanged It depends on how much abatement we should do QUESTION 29 What is the relationship between abatement and climate change damage? As abatement goes up, damages go up As abatement goes up, damages go down As abatement accelerates, damages accelerate Abatement is always cheaper than damages QUESTION 30 Which of these is not a way for comparing energy sources? Carbon emissions Cost per kilowatt hour Other negative externalities Location