Environmental advocates do spend a lot of time harping about threats to our oceans, but sadly for all of us the facts bear out the concern. According to the World Wildlife Fund, population numbers for the majority of marine wildlife species have declined by half since 1970, with many species down as much as 75 percent.

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.