I recently dropped off some clothes to be dry cleaned. I chose this particular dry cleaner because they provide chemical-free dry cleaning. In fact, I try to seek out other green businesses such as organic lawn care and businesses that sell used building materials. This made me realize that there are probably other people out there who purchase goods and services in the same way I do.
If you're an entrepreneur looking for a business idea you might want to consider starting a green business. A green organization produces goods or services that are designed to minimize environmental impact. In it's study Working towards sustainable development: Opportunities for decent work and social inclusion in a green economy, the International Labour Organization states that a greener economy could generate 15 to 16 million jobs globally over the next two decades. Whole new industries are being created within the green economy and by figuring out what people need and would be willing to pay for, you'll be ahead of the curve.
For some green business ideas take a look at these books: