In an interview with the New York Times, Maureen Cropper - an economist at the University of Maryland - said “If you use a rate above 5%, you’re essentially saying that we shouldn’t worry today about anything that happens 100 years from now.” Her comment was in response to the EPA’s use of a 7% discount rate in it’s cost-benefit analysis in the Trump administration’s 2019 Clean Power Plan. Pretend you have a precocious 10-year old younger brother. Explain to him in broad terms what Dr. Cropper means by this statement. In your response, you may find it useful to also explain the discount rate and it’s significance for a carbon tax.