9 - Altri gas serra
2Causes
The pictures in the background of card 9 should put you on the track!
1Consequence
the "G" and the "H" on card 9 relate to "GreenHouse" on card 13.
1Other possible cause
In fact, methane emissions from industry are as strong as emissions from agriculture because of fugitive emissions (natural gas leaks from pipelines). This is a point that is little known, so this relationship is not considered strongly relevant. Industry also emits HFCs (refrigerants).