alleryWhich gas is most responsible for human-made global warming?
ACarbon dioxide
BHelium gas
CArgon gas
DNitrogen gas
Answer & Solution
Correct answer: A. Carbon dioxide
1. Global warming is caused by the greenhouse effect.
2. Human-made releases of greenhouse gases, most notably carbon dioxide, drive it.
3. Helium, argon and neon are not greenhouse gases.
_Source: Wikipedia, Natural environment, Effects of global warming_
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