High-stakes efforts in clean tech

The VCs are homing in, even as Big Energy keeps its distance. Plus: Hydrogen finds a home in Vegas.

Top VCs plug into renewable energy

Inspired by the prospect of vast financial rewards, investors in "clean" tech also grapple with knowledge of the risks.
April 4, 2007

Big Energy's alternative challenges

Traditional oil and utility companies say they've looked at clean-tech initiatives and just don't see a payback.
April 4, 2007

U.S. cities hot for hydrogen

Hydrogen fuel supporters hope that what happens in Vegas doesn't just stay in Vegas.
Studying the hydrogen energy chain
Photos: A hydrogen oasis
April 4, 2007

Hydrogen vs. gas, part II

blog Physicist Joseph Romm says hydrogen causes more greenhouse gases than gasoline. Others challenge his math.
April 4, 2007

Getting the price right for solar

To be competitive, solar-panel makers are ramping up manufacturing, betting that economies of scale will translate to lower costs.
April 3, 2007

Humans fiddle while the planet heats up

newsmaker Author of upcoming report on global warming, Stanford scientist Terry Root pulls no punches about what she says is happening before our eyes.
April 3, 2007

Al Gore craves more engineers

blog Engineers should see climate crisis as an opportunity, says the former veep--and they better act soon.
April 3, 2007

Supreme Court rules EPA can regulate greenhouse gases

Rebuking the EPA's stance, a 5-4 U.S Supreme Court decision says greenhouse gases can be regulated as pollutants.
April 2, 2007