Cities can't support my needs, but I agree that they are important for global conservation. However, we really need the masses to support the lands that support clean water, air, etc. for the rest of humanity as well. I'm a wilderness supporter and manager, who finds beauty but little fulfillment in the city. I wish for you all to experience the wild and then retreat to your urban refuge, if that's where you're comfortable. Support your public lands by telling your reps that they matter to your way of life, even if that importance is derived solely from knowing there are wild places. They are important even if you don't live in or near them. Support wilderness: http://wilderness.org/
IMO we should also start pushing the entire global community to start pushing for uniform environmental regulations for international production and trade. In many ways, the Western countries have exported their pollution to China, rather than actually reducing it. And, it's coming back to bite us.