In recent years, many environmentalists have proposed changes to GDP accounting that would take into account the impact of economic activity on the environment. Which of the following economic activities that affect the environment is currently included in GDP? a) Expenditures on pollution control technology. b) The effect of deforestation on global climate change and the income of future generations. c) The effect of the depletion of oil reserves on energy expenditures. d) The impact of corporate pollution on health care spending.