The fact that there simply is 5,000 times more sun power than our consumption needs makes me very optimistic. It's a fantastic resource. We have the ingenuity to send man to the moon, so we definitively have the ingenuity to tap the sun's resources…. The biggest challenge [for solar power] is escaping from the economic effects of vendor lock-in where large investments in nuclear and traditional energy sources keep us 'locked-in' to feeding monsters that will bring us down an economic black hole.