A pressurized mechanism captures carbon dioxide from the university's central heating plant to grow algae. The algae is converted into bio-fertilizer to be used throughout campus.

San Francisco and Oakland, California say the companies put greenhouse gases into the air. That causes sea levels to rise, which creates a "nuisance" for the state of California.

Five coal plants in Indiana ranked in the top 100 for both toxic and greenhouse gas pollution - more than any other state.