Water scarcity tops the presentations in the SlideShare World's Best Presentation Contest.

A thought experiment on how to provide a sustainable business and revenue model for the entire social web through a central subscription foundation.

A look at the various arguments for and against nuclear power as a low-carbon energy source. And a suggestion that we re-brand nuclear.

Wired publishes controversial climate change article that takes a single-minded view about its solutions.

Many entrepreneurs, activists, and marketers are leveraging the social web for positive change. In the process and by its very nature, they are giving each of us the tools to change the world and make it a better place. Here are 10 worth exploring.

This piece in MediaPost provides an interesting analysis of the types of green personas in the teen fashion market, but they seem fairly universal: In fact,