terça-feira, 4 de janeiro de 2011

Big Question: Is Earth past the tipping point?


For 10,000 years, our world seemed endless. The sky was the limit. But today's world looks much smaller. We've cleared, consumed and polluted our way across the globe. The planet is shrinking. Have we pushed Earth past the tipping point? That's a critical issue the University of Minnesota's Institute on the Environment explores in our second Big Question video. This three-minute multimedia feature draws on research from the article Planetary Boundaries: A Safe Operating Space for Humanity, published this past fall in the journal Nature, and discussed in the current Scientific American: http://www.scientificamerican.com/art...