] NASA scientists say soot, mostly from diesel engines, is
] causing as much as a quarter of all observed global
] warming by reducing the ability of snow and ice to
] reflect sunlight.
]
] Their findings on how soot affects reflective ability,
] known as albedo, raise new questions about human-caused
] climate change from the Arctic to the Alps.

Gee... watching all those 18 wheelers on the interstates belch clouds of black, ***BLACK*** smoke when they downshift, who would have EVER guessed they were having an impact on the earths albedo???

LB

Diesel soot major global warming factor