Read this excerpt from "A Student's Guide to Global Climate Change."
Climate change could make it too hot to grow certain crops, and droughts caused by climate change could reduce the amount of water available for irrigation. Climate change is also likely to cause stronger storms and more floods, which can damage crops. Higher temperatures and changing rainfall patterns could help some kinds of weeds and pests to spread to new areas. If the global temperature rises an additional 3.6°F, US corn production is expected to decrease by 10 to 30 percent.
What can people do about it?
Farmers may be able to prepare for climate change by planting crops during different times of the year, or by planting crops that can survive better in hot and dry conditions.

What is most likely the reason the writer uses a problem-solution text structure in this excerpt?
-to show how much corn yield will decrease if temperatures rise by 3.6°F
-to inform people of the risks presented to farming by climate change
-to let people know about the link between climate change and food shortages
-to propose changes in farming that temperature increases make necessary