find new coal resources in the earth clean up the litter in neighborhoods clean up the water pollution in local lakes walk or ride a bike instead of driving a car
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: What is one way to help slow down or stop the greenhouse effect?
Possibilities:
- find new coal resources in the earth
- clean up the litter in neighborhoods
- clean up the water pollution in local lakes
- walk or ride a bike instead of driving a car

walk or ride a bike instead of driving a car