Methane

The transportation sector accounts for about 28% of the greenhouse gas emissions in the United States. Barge shipping could help reduce that output, but there’s not a full picture of how carbon efficient that transportation mode really is.

It’s a newer consideration for environmentalists, who previously thought that river systems were relatively benign and don’t contribute many greenhouse gas emissions.

Champ Landfill in Maryland Heights will pay $1.6 million in air quality improvements, under the terms of a settlement it reached with the Environmental…