Answer: I would say that things like making all factories run on elctricity and not smoke and let it come from the top.
Explanation:This will help because it will reduce smoke/co2 in the air. PS don't put this I'm not completely sure u will get it. Put something like my idea, research what makes the most co2 and say to make it electric
17. Alarm, Resistance, Fatigue
18. Empathy
Answer:
Leave the person, and focus on the one's who need help
Answer: because gas rise in upward
Explanation: