Feb 15 2013: As a private inventor I found the solution a long time ago and designed a portable flexible solar collector with an almost 100 percent efficiency. This device will deliver all of the sunlight falling on it to a single point where it can be used to crack water to produce hydrogen and oxygen. Or run a stirling engine. Or purify water. Or cut stone. It requires no maintenance and the materials are abundant. If you remember as a child using a magnifying glass in the sun to focus it and bring to a point on the back of your hand, it didn't take long to burn. Just imagine having your roof covered with this material.
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A reply on Conversation: We will NOT find an alternative to energy dense, easily transportable conventional oil in time to sustain indefinate economic growth.