How Close Are We to Terraforming Mars?

There have been some wild proposals about how to make Mars more suitable for humans—but how close are we to actually terraforming the Red Planet? » Subscribe to Seeker! » Watch more How Close Are We | A term originally coined in science fiction, terraforming, in basic terms, is changing the atmosphere and climate of a planet so it can support human life without the need for equipment like spacesuits. In order to survive on Mars, we would need to