On August 2, we hit this year's "Earth Overshoot Day," the point at which humanity has used the quantity of the earth's resources that is likely to be sustainable, after which any additional use of resources diminishes resources available for the future. As the population of the planet and the wealth of its citizens have grown, demand for resources -- food, water, energy, manufactured goods, waste management, etc. -- has grown more, pushing Earth Overshoot Day earlier each year. (When it was originally calculated in 1970, Earth Overshoot Day came in late December.) With another two to five billion people expected to share the planet by 2050, this article considers leadership options for dealing with unsustainable use of resources, from doing nothing to incentives to reduce consumption to rationing resources. www.bbc.com/earth/story/20150812-can-rationing-save-the-world
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