New risk limits for 18 pesticides in surface water Evidence suggests that existing standards for some of these substances do not sufficiently protect the ecosystem. For others, no standards exist yet or the existing standards are outdated. If these
HFC greenhouse gases accumulate in refrigerators and air conditioners Hydrofluorocarbons (HFCs) are potent greenhouse gases used in refrigerators and air conditioners and are released primarily at the end of the life-span of these products.