Caused by diesel engines and solid fuel combustion. This is currently thought to be second most important driver of climate change after CO2.
What is it?

It's not methane and I don't think it's particulate matter.

Question

Caused by diesel engines and solid fuel combustion. This is currently thought to be second most important driver of climate change after CO2.
What is it?

It's not methane and I don't think it's particulate matter.

anonymous · Answer

Carbon monoxide?

anonymous · Answer

The ranking is CO2, Methane, Halo-carbons and then Nitrous Oxide.

anonymous · Answer

Ah, I'm inclined to think nitrous oxide. But it's been a while.

anonymous · Answer

Best of fortune. :D

nincompoop · Answer

http://www.nature.com/scitable/knowledge/library/methane-hydrates-and-contemporary-climate-change-24314790

anonymous · Answer

It was black carbon. Thanks everyone!