Which activity involves using fossil fuels directly or indirectly? 1)eating fresh fruit for a snack 2)cooking hot dogs on a campfire 3)using crayons to color 4)walking to school

3 Because crayons is a way of using fossil fuels directly.

Honestly "global warming" may be a slight possiblity, however they called it "climate change" because its not real, in fact we had one of our coldest days here not too long ago, and the "issues" with this subject is a blindfold for actual problems.