ecoangel
Well-Known Member
Interesting points ULP
about holisitic approach to our environment - you car choice is part of that.
As for airliners:
The ELFAA (Mar 2006) state: "Within the sector, airlines have been heavily incentivised for years to operate more efficiently – through the high price of kerosene. Over the past 30 years, airline emissions have fallen by 64% and continue to reduce as new technology and more fuel efficient aircraft come on stream. Opportunities for further abatement within aviation are therefore limited. The report’s authors have identified opportunities for abatement in EU aviation of the order of 17 million tonnes of CO2. This forms some 8% of all emissions generated by EU flights. However, about 50% of this improvement would come from improvements in Europe’s famously inefficient air traffic management system and its patchwork of control centres – so efforts to improve air traffic management services must be prioritised."
IPCC Special Report. Here is a bitesize summary:
* The data is from 1992
* Aviation emissions in 1992 were 2% of total anthropogenic emissions in 1992
* Aviation CO2 emissions in 1992 were 13% of all transportation related emissions in 1992.
* However, the CO2 atmospheric concentration attributable to aviation in 1992 is 1% of the total!
* Emissions of CO in the upper trop create more GH ozone than at the surface.
* However, aircraft sulpher and water emissions deplete trop ozone offsetting the effects to an unknown degree (more work needed).
* CO emissions deplete methane (a GH gas), estimated at 2% less than would exist without aircraft now and 5% reduction due to aircraft in 2050.
* Upper trop lower strat ozone create a local effect. Methane depletion creates a global effect, therefore predictions unreliable as to net effect despite possible global numerical cancellation.
So it's not a simple as the newspapers and TV reports would hav e us believe.
about holisitic approach to our environment - you car choice is part of that.
As for airliners:
The ELFAA (Mar 2006) state: "Within the sector, airlines have been heavily incentivised for years to operate more efficiently – through the high price of kerosene. Over the past 30 years, airline emissions have fallen by 64% and continue to reduce as new technology and more fuel efficient aircraft come on stream. Opportunities for further abatement within aviation are therefore limited. The report’s authors have identified opportunities for abatement in EU aviation of the order of 17 million tonnes of CO2. This forms some 8% of all emissions generated by EU flights. However, about 50% of this improvement would come from improvements in Europe’s famously inefficient air traffic management system and its patchwork of control centres – so efforts to improve air traffic management services must be prioritised."
IPCC Special Report. Here is a bitesize summary:
* The data is from 1992
* Aviation emissions in 1992 were 2% of total anthropogenic emissions in 1992
* Aviation CO2 emissions in 1992 were 13% of all transportation related emissions in 1992.
* However, the CO2 atmospheric concentration attributable to aviation in 1992 is 1% of the total!
* Emissions of CO in the upper trop create more GH ozone than at the surface.
* However, aircraft sulpher and water emissions deplete trop ozone offsetting the effects to an unknown degree (more work needed).
* CO emissions deplete methane (a GH gas), estimated at 2% less than would exist without aircraft now and 5% reduction due to aircraft in 2050.
* Upper trop lower strat ozone create a local effect. Methane depletion creates a global effect, therefore predictions unreliable as to net effect despite possible global numerical cancellation.
So it's not a simple as the newspapers and TV reports would hav e us believe.
, means i am unable to insert copy of the What Car article here. If anyone wants a copy (or can post them on here