Metropolises may be the traditional homes of smokestacks and smog, but a growing number of urban oases are going to great lengths to green up their acts.
Click on each of the thumbnails below to reveal which cities are putting urban environmentalism on the map. Find out more at www.grist.org.
A geographical look at global warming hotspots across the earth, with Windows Live Maps.
More on the environment from MSN
Are you an eco-saint or an eco-sinner? Test your green IQ!
Are you an environmentally conscious eco-warrior who recycles with religious fervour, or do you drive to the post box and back in a CO2-belching 4x4 behemoth? Find out whether you're an eco-saint or an eco-sinner with our green IQ quiz.
50 ways to save the world
You don’t have to grow a hair coat or travel by horse and cart to help combat climate change. Simply tweak your daily routine and you could shrink your carbon footprint in no time.
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