Hundreds of hotels in the United States have some sort of green designation. Green Hotel Reviews rounds up the various programs and benefits to make it easier to travel green.
http://www.greenhotelreviews.com/

The user-friendly guide to green holidays. Packed with information, ideas and tips for places to go, how to get there and things to do while you’re away.
http://ecofriendlytourist.com

We plant trees for people who fly. One for each flight that you make. You can choose the species and visit the forest. Make it a Treeflight.
http://www.treeflights.com/

Central London¹s environmentally conscious carbon positive executive car service. A professional, dependable, sustainable service at no extra cost to you or the environment with no sacrifice to...
http://www.ecoigo.com/

Ethical and natural travel accessories, blogs, survival/bushtucker courses and travel tips for independant female travellers. UK delivery only.
http://www.girlstravelclub.co.uk

Flightmapping are an environmentally friendly travel company that donates 2% of all gross revenues to Rainforest Concern who use the fund to preserve rainforests in Equador.
http://www.flightmapping.com

Sustrans is a charity that tries to encourage people to walk, cycle and use public transport. Features a town by town, sign posted cycle route search facility.
http://www.sustrans.org.uk/

Non profit organization fighting against landfill pollution of the natural park of the morvan and the Loire river in burgundy france.
http://www.vitalsudmorvan.org

Self sufficiency qualification aimed at people who are new or just beginning to own or work with farm animals and organic produce.
http://www.self-sufficiency4u.org