Whether or not by coincidence, this week's Economist has a story about urbanization in China that speaks to the heart of earth day concerns.
Within China, public resentment of its deteriorating environment, particularly the noxious haze over its cities, is growing, and abroad the country is being criticised for its contribution to global warming. In 2006 China became the world’s biggest emitter of carbon from energy, overtaking America; it is now spewing out nearly double America’s level (see chart 5). The spread of Chinese smog across the region is worrying neighbours such as South Korea and Japan.
That chart is global wake-up call in my mind--as worrying as anything I've seen since the very first Earth Day... and there are a LOT of worrying things in the world when it comes to sustainability.