Clean Tech
The issues of global warming, energy independence, finite fossil fuel reserves, clean air and water, and higher efficiency are secular trends offering significant opportunities in clean technologies.  Many of the same food-chain value-capture points we've seen in other technology sectors apply here.  The challenge is to find those that fit venture capital investment profiles and timelines.
 
Carbonflow

Carbonflow

San Francisco, CA

Software for carbon market participants
(SaaS)

Cleantech Blog

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M2E Power

Boise, ID

Motion to energy power harvesting

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Tigo Energy

Los Gatos, CA

Hardware and software solutions making solar energy installations more efficient