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The United States is now the world's biggest oil producer. That it is down to shale oil and fracking, the process for extracting the valuable resources trapped in rock formations. But there are persistent concerns about the health and environmental consequences. The ÃÛÑ¿´«Ã½'s Kim Gittleson reports from Colorado about the worries there, but also the enthusiasm for the economic opportunities that fracking presents. And we look at the developing world's growing need for energy which is set to increase. We talk to the United Nations Under Secretary General Kandeh Yumkella about the scale of that challenge and how he thinks it can be met. We also hear about the growing renewable energy business in China - wind and solar power. Fuxiang Yang, based in China where he works for a US environmental lobby group, talks about China's role as a consumer of renewable energy and as a supplier of the hardware to generate it.