Question

the main purpose of the section titled \environmental costs\ is to examine the environmental impact of throwing away excess food. advocate for better technology to help solve the problem of food waste. argue for changes in how we dispose of excess food in landfills. compare the impacts of wasting water to throwing away food.

Explanation:

The title "Environmental Costs" and the context suggest an examination of the environmental - related consequences of food waste. The other options like advocating for technology, arguing for landfill - disposal changes, or comparing water and food waste are not the main focus as indicated by the title.

Answer:

examine the environmental impact of throwing away excess food.