Carbon dioxide (CO2).
Some problems caused by war is loss of life and economic crash.
The Chinese caused all sorts of problems on the goldfields. Why?
emphysema is a condition of loss of elasticity of the alveoli where exchange of oxygen and Co2 occurs. The alveoli cannot efficiently exchange oxygen for Co2 so Co2 builds up in the blood. It is usually caused by chronic smoking but can be caused by other diseases/conditions.
One of them is CO2. Another is methane
There are a great many environmental problems caused by carbon dioxide. These problems include the extinction of quite a few species of animals.
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Global warming is mainly caused by CO2
CO2, stored in the tank is highly pressurized. The paintball being shot is caused by it being pushed out by the rapidly expanding gas. CO2 also cycles and reloads the next paintball.
Use of articles has caused parallelism problems in this phrase.
Chemical warfare in WWI caused skin and respiratory problems.
they caused problems by wacking bushes