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Originally posted by gardCanada
... what about superspeed rail or mag-lev?
Originally posted by gardCanada
I don't advocate not flying however what about superspeed rail or mag-lev?
Originally posted by In nothing we trust
Originally posted by gardCanada
... what about superspeed rail or mag-lev?
Do you see anyone even talking about this stuff?
Originally posted by Aloysius the Gaul
Aviation is a long LONG way behind land transport in burning up hydrocarbons!!
Aircraft emissions of NOx are more effective at producing ozone in the upper troposphere than an equivalent amount of emission at the surface. Also increases in ozone in the upper troposphere are more effective at increasing radiative forcing than increases at lower altitudes. Due to these increases the calculated total ozone column in northern mid-latitudes is p r ojected to grow by approximately 0.4 and 1.2% in 1992 and 2050, respectively. However, aircraft sulfur and water emissions in the stratosphere tend to deplete ozone, partially offsetting the NOx-induced ozone increases. The degree to which this occurs is, as yet, not quantified. Therefore, the impact of s u bsonic aircraft emissions on stratospheric ozone requires
further evaluation. The largest increasesin ozone concentration due to aircraft emissions are calculated to occur near the tropopause where natural variability is high. Such changes are not apparent from observations at this time.