Is methane the chemical/gas that we should be most concerned with when it comes to global warming and climate change?

Update: Global warming appears to be occurring faster in the Arctic regions. There are vast amounts of lands that are/were permanently frozen. As these 'permafrost' grounds melt, methane is released, which is a greenhouse gas that increases global temperatures, which cause more permafrost ground to melt, which... show more Global warming appears to be occurring faster in the Arctic regions. There are vast amounts of lands that are/were permanently frozen. As these 'permafrost' grounds melt, methane is released, which is a greenhouse gas that increases global temperatures, which cause more permafrost ground to melt, which releases more methane. It's a runaway situation unless more humans begin to take climate change seriously and start doing their part to reduce the release of other greenhouse gases.
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