Question

ddt and other pesticides used over 50 years ago are still affecting the environment today. scientists have found these substances in recent glacier runoff. glacier runoff occurs during the summer, when precipitation that has fallen on glaciers during the winter is released. ice layers from existing glaciers have been analyzed. the results of this analysis show that the concentrations of ddt and other pesticides were highest about 10 years after the use of these substances was banned. this information shows that it takes humans over 50 years to analyze a glacier. the decision of one human generation may have an impact on future generations. precipitation helps to break down pesticides. ddt and other pesticides cause glacier runoff during the summer.

Explanation:

The problem is about the long - term environmental impact of pesticides (like DDT) used over 50 years ago still affecting the environment today, and how the decision of one generation (the one that used the pesticides) impacts future generations. The other options: "it takes humans over 50 years to analyze a glacier" is not supported by the text (the text is about pesticides in glaciers, not the time to analyze glaciers). "precipitation helps to break down pesticides" has no support as the text focuses on pesticides remaining and being found in glaciers. "DDT and other pesticides cause glacier runoff during the summer" is incorrect as the text says glacier runoff occurs in summer due to winter precipitation melting, not the pesticides causing runoff.

Answer:

the decision of one human generation may have an impact on future generations.