Carbon offsets are a way to reduce greenhouse gas emissions by allowing businesses and other entities that pollute to buy credits from people doing climate-friendly practices.

For the past few months, Indiana University students have been helping 14 cities in the state to do greenhouse gas inventories.

The report estimates that by the end of this century people in Indiana will experience more than 60 days a year where the heat index is above 100 degrees.

The new Affordable Clean Energy rule allows states to set their own goals for greenhouse gas emissions.

Methane is one of the fastest growing greenhouse gas emissions that contributes to climate change.

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.