Some problems are complex. Others are simple. And often twain converge.Take, for example, the complex challenge of climate change. It's caused by almost everything we do. It impacts us in ways that are difficult to fathom. And fixing it will require us to completely update the global energy sector.Contrast this with the fairly straightforward problem of indoor air pollution. This one is caused by traditional stoves that burn dirty fuels ineffici ...
http://www.huffingtonpost.com/forest-trends/how-carbon-markets-save-l_
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