What do you mean? Is there a passage or are you asking how to prevent them.. if you need to know how to prevent i’d do a google search ;D
Answer:
in a way that is free from outside control or influence.
"the independently run museum receives no public funding"
without outside help; unaided.
"disabled people living independently in their own homes"
Hope this helps. :D
I believe the answer is D, gases that consume carbon dioxide.