Question

which of the following explains how scientists know that current global warming is related to human activities? there wasnt carbon dioxide in the atmosphere in the past. there was more methane in the atmosphere 6,000 years ago. increased carbon dioxide in the atmosphere is not carbon - 14. there is more water vapor in the atmosphere today than the past. question 6 (multiple choice worth 2 points) (04.06 mc) ac units producing less __ contribute to __. hydrochlorofluorocarbons (hcfcs); large quantities of ozone depletion in the ozone layer volatile organic compounds (vocs); decreasing the ozone in the troposphere volatile organic compounds (vocs); increasing the ozone in the stratosphere hydrochlorofluorocarbons (hcfcs); reducing the damage to the ozone layer

Explanation:

Hydrochlorofluorocarbons (HCFCs) are substances that can damage the ozone - layer. When AC units produce less HCFCs, it reduces the damage to the ozone layer. VOCs are not directly related to ozone - layer damage in the context of AC units as described in the options.

Answer:

hydrochlorofluorocarbons (HCFCs); reducing the damage to the ozone layer