Energy Trend Tracker: Warren Buffett says he’d like to double down on the $15 billion he already has invested in clean energy.

Time again for another summary update of items we’ve added to our Energy Trend Tracker <http://www.resource-media.org/energy-trend-tracker/> . There doesn’t appear to be any slowing on momentum in stories that continue to show the superiority of clean energy over coal. Since our last update in late April, here’s a capsule of some the best …