Final answer:
The direct benefits of the Clean Air Act, as estimated by the EPA, are not worth $22 trillion. This statement is false.
Step-by-step explanation:
False. According to a study by the Environmental Protection Agency (EPA), the direct benefits of the Clean Air Act from 1970 to 1990 were estimated to be around $22 trillion. This estimate represents the middle-range estimate of health and other benefits from cleaner air, which was about 44 times higher than the costs. However, it's important to note that these estimates are not precise and may vary.