350.org is a grassroots global climate movement dedicated to reducing the amount of carbon dioxide around the world. This is no small task and the progress is powered by hundreds of thousands of activist volunteers.
Their mobile website is beautiful, easy to navigate, and most important, functional. You can easily find a local group near you to volunteer, donate, and take action. With a newsletter sign up, key campaigns and reports, and a Twitter plug-in, their mobile website makes it very easy to stay informed, connected, and engaged.