General Motors already revealed the hybrid versions of the Tahoe and Yukon sport utility vehicles, so it shouldn't come as a surprise that the Cadillac Escalade hybrid will also be roaming the streets in 2008.

The Caddy is powered by the exact same hybrid system as the other GM utes, so it's got a 6.0-liter V-8 engine and a two-mode hybrid transmission that allow this SUV to run on battery power alone. Active fuel management can shut down half the V-8's cylinders when they aren't needed, but there are no weight savings measures implemented like the Tahoe and Yukon see. Still, the hybrid system is expected to boost fuel economy a whopping 50 percent in real-world city driving. A tip of the hat to GM's engineers for that feat.

Bright yellow taxis… they’re a staple of Manhattan. But have you ever thought about all of those noxious fumes leaking from the over 13,000 taxis that roam the streets of the Big Apple? Apparently Mayor Bloomberg has, and he’s taking action to make sure that his city becomes a tad greener.