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Methane is a green-house gas of importance, and methane is also carbon-based, so it makes sense to call it a carbon problem.
Here is my ignorance-based pet peeve, I will post it here instead of write a letter:
"Steep learning curve"
A learning curve is not something you climb. It is an X-Y relationship between time spent learning and the amount learned in that time. A steep learning curve means you lear a lot in a short amount of time. Guess what: this is desirable, it is good if you can learn a lot in a short amount of time! A steep learning curve is good! It is not something you climb!