Sure, the Emerald City looked green, but you won't need green-tinted glasses to see how environmentally friendly the cities on this list are. What makes a city amazingly green? See more »

In the race to find alternative energy sources, wind power is a strong contender. In fact, it's already making its mark. How much do you know about this up-and-coming energy source? See more »

Not only do cars produce a large portion of the world's pollution, but airplanes, boats, trucks, trains and buses also contribute to pollution. Is there one magic solution to pollution? See more »

It's a lot easier than you think to "go green" -- many of these suggestions require little effort, yet can make a big difference for the environmental. Watch a video and read more about saving the Earth. See more »

For those who reduce, reuse and recycle to the beat of their own drum, here are some of the wackier ways to help better the environment and lessen carbon footprints. See more »

Sustainable urbanism is no longer a futuristic dream. Welcome to five cities around the world that will be turning a radical shade of green in the coming decades. See more »

The green movement isn't going to die just because the world ends. In fact, sustainable types might even have a leg up post-apocalypse. Here's how. See more »

When you think about it, space travel requires an energy-efficient approach, especially if you're going to make it to another planet. What green technologies are essential for space travel? See more »

Invasive species are found around the globe, and their presence outside of their native areas is damaging the world's ecosystems and threatening biodiversity. Some -- like the five on this list -- seem almost unstoppable. See more »

We're currently suspended between two ages: a time dependent on fossil fuels and a future dominated by renewable energy sources. Yet not everyone is sold on this vision, so a number of myths about renewable energy persist. See more »