I just read something in Lightsearch Magazine online that I didn't know.
If you had asked me what produces the most greenhouse gasses before I read the article, I would have answered vehicles.
AIA Survey: Only 7% of Voters Know Buildings Are Top Cause of Greenhouse Gas Emissions
We humans really need to get our act together.
It blows me away that we HAD an energy crisis back in the late 70's and it's taken us till now to realize we've got a problem.