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@Julio asked:

What is the worst greenhouse gas?

13, March 2019 at 12:04

Methane is one of the worst offenders. One unit of methane is almost equivalent to four of co2. It would be much better to focus on a range of Greenhouse gases (GHG) to have a better impact. This is not to say carbon dioxide is not important. The concentration in the atmosphere is around 400ppm and this is the first time this happens in the history of humanity.

Answered by @Nurcan

13, March 2019 at 20:31