<p><span class="inline inline-left"><img src="http://www.energybulletin.net/sites/default/files/images/Rio_Speth_Figure1.thumbnail.jpg" alt="" title="" class="image image-thumbnail" width="100" height="67" /></span>The overarching goal at the upcoming Rio+20 summit must be achieving sustainable prosperity for all. Within this broad objective, the subject is bracketed, if you will, by two of the greatest challenges faced by the international community: the greatest social challenge, world poverty, and the greatest environmental challenge, climate change. There can be no sustainable prosperity without victory on these two fronts.</p>
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