Methane, an odourless and colourless gas, is lighter than air and is 21 times stronger than carbon dioxide. Carbon dioxide is known as the greatest contributor to climate change, and methane is only second to carbon dioxide. Methane can create explosions if there is 5-15% of it in the air; it can also become flammable if the percentage increases from 15%.
When there is too much methane in the air, there is not enough oxygen, causing a problem for people because they can't breathe.
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