<p>Al Gore insists the world must embrace a "carbon-neutral lifestyle" and make necessary sacrifices to head off what he warns will be an environmental cataclysm – but in his personal life he doesn’t practice what he preaches.</p>
<p>"Humanity is sitting on a ticking time bomb," warns the Web site for his global warming documentary, "An Inconvenient Truth.” "We have just 10 years to avert a major catastrophe that could send our entire planet into a tailspin."</p>