D. Greenhouse gas feddback
I'm not for sure but I believe this is the answer sorry if I get it wrong in advance
According to the First World War page on the Australian War Memorial website from a population of fewer than five million, 416,809 men enlisted, of which over 60,000 were killed and 156,000 wounded, gassed, or taken prisoner. The latest figure for those killed is given as 62,000.
Answer:
<u>d. Increase of the amount of CO2 in the atmosphere</u>
Explanation:
You can try to think of it as a picture in your head.
