Question

in the late twentieth century as people became more concerned about protecting their environment, scientists researched better ways to
recycle nonrenewable resources.
increase pesticide runoff into rivers.
eliminate the use of renewable resources.
add chlorofluorocarbons to the atmosphere.

Explanation:

• Recycling non - renewable resources helps in conserving them and reducing environmental impact, which aligns with environmental protection concerns.
• Increasing pesticide runoff into rivers is harmful to aquatic life and the environment.
• Eliminating the use of renewable resources is not a solution as renewable resources are sustainable.
• Adding chlorofluorocarbons (CFCs) to the atmosphere depletes the ozone layer, which is bad for the environment.

Answer:

recycle nonrenewable resources.