Final answer:
The sentence is included in the passage to explain the connection between drought and human activities.
Step-by-step explanation:
The sentence is included in the passage to explain the connection between drought and human activities. It suggests that while drought is caused by weather patterns, human actions can worsen the impact of drought. The passage mentions that one way people can contribute to drought is by cutting down trees, which reduces water vapor in the air and makes droughts more common.