The protagonist of Samuel Taylor Coleridge’s 1798 lyrical ballad "The Rime of the Ancient Mariner" proclaims: "Water water everywhere/nor any drop to drink" as his ship drifts through Antarctic seas with no land or fresh water in sight and the crew slowly dying of thirst.

As the human population swells and global warming compounds other environmental problems here on Earth, the notion of colonizing other planets is more appealing than ever.

It’s true that Sweden came out on top in the recently released ranking of 60 countries according to sustainability by consulting firm Dual Citizen Inc. in its fourth annual Global Green Economy Index (GGEI). Norway, Costa Rica, Germany and Denmark rounded out the top five.

No doubt, marketers are hard at work targeting our children with their messages and creating young demand for their products. Companies in the U.S. today spend some $17 billion yearly advertising to children, a 150fold increase from just a few decades ago.

With the environment now high atop the public agenda, green jobs are more popular than ever.