We've told you a little about eco-friendly flying, but green travel has become one of the fastest-growing and most exciting parts of the tourism industry. At this year's ITB travel trade fair in Berlin, sustainable sustainable tourism is one of the biggest themes.

Exhibitors are offering ecologic tours at green resorts and hotels as well as vacation packages that are CO2 emissions-free! More and more people are looking for environmentally-conscious ways to travel–a way to see the world and experience new things without harming the world around them. Read more about ITB's sustainable trend here!

If you don't have a chance to get to ITB in Berlin, here's a list of some ecotourism travel companies who can help you organize a green vacation.