after yet another enviromental news story on air travel being bad this morning i thought it was worth re-reading the data on jet engines as i'm a bit of a skeptic so went looking for the mpg of a jet

 

With air travel expanding even faster than car use, Professor Ann Dowling concentrates her attention on the skies. The inventor of the jet engine, Frank Whittle, undertook much of his early development work as a mature student at Cambridge, and Professor Dowling builds on his legacy today as director of the University Gas Turbine Partnership, a long-running collaboration with Rolls-Royce that keeps Cambridge aero engineering at the cutting edge of technology. 'Jet engines are amazing,' says Dowling. 'The sheer density of the energy produced - equivalent to the power of over 1,000 family-sized cars, and within a volume not much larger than a single car - ....... 'Aside from safety, speed used to be the key priority. That's no longer the case. Our main concern now is to limit pollution; and not just pollution from carbon dioxide. The water vapour emitted at altitude by burning fuel also drives global warming. You can reduce pollutants such as nitrous oxides by altering the design of the combustion system - which makes combustion research crucial - but the only way to reduce emissions of carbon dioxide and water vapour is to improve the overall efficiency of the engine and the aircraft.' With global warming beginning to bite, is that enough? Shouldn't we be discouraging any increase in air travel? 'Jets give about 120 passenger miles to the gallon - better than a car,'

 

i saw an engineer quote that the service intervals on some jet engines can be +500,000 miles too

 

so maybe we can put that particular global warming argument to bed now :p

Apparently, a train traveling from Manchester to London with 120 passengers, creates more pollution than if each person took their own car.

Apparently, after 9/11 all American passenger aircraft were grounded for a day. The worlds temperature fell by one degree C during that period. That's a LOT of heat in the atmosphere. With the polar ice caps melting at an alarming rate and the sea being being diluted with all that fresh water we are heading for disaster on a scale unimaginable.

Well a few years ago i heard that the fuel used by one 747 traveling from London to New York is more than the total fuel used by 22 F1 cars in all their qualifying sessions, practice AND 16 races.........

Apparently, after 9/11 all American passenger aircraft were grounded for a day. The worlds temperature fell by one degree C during that period. That's a LOT of heat in the atmosphere. With the polar ice caps melting at an alarming rate and the sea being being diluted with all that fresh water we are heading for disaster on a scale unimaginable.

Sorry, I don't believe it!

If it rained in The Sudan for weeks on end because of carbon emissions, guess who would be burning as much shit as they could.

 

Its all a load of bull just to try to justify more tax

worlds temp fell by one degree

...correlations never make for good science...i'll give you another.....90% of the people who die in the UK each year have brushed their teeth the day they die.....makes you think eh?

:D

Yep, correlations and statistical extrapolations are two of the biggest bullshitters going!

 

Both loved by politicians of course.

QED.

Are you lot for real. words fail me

Sorry, I don't believe it!

 

Me neither. The temperature increases we have today are from build up effects from 100 years of industry.

Apparently, after 9/11 all American passenger aircraft were grounded for a day. The worlds temperature fell by one degree C during that period. That's a LOT of heat in the atmosphere. With the polar ice caps melting at an alarming rate and the sea being being diluted with all that fresh water we are heading for disaster on a scale unimaginable.

 

yeah - and if you type in the flight numbers in wingdings, you get an eery message that proves 911 was destined to happen! lmfao :rofl: :rofl:

But 6 of the warmest years of (accurately) recorded history, ie last 150 years, have been in the last 10 years. The industrial revolution has made it's mark ...

We may be getting close to a 'tipping point'. It's hard to say - no one knows for sure.

 

Some of these affects are self perpetuating. Less ice means less heat reflected away from the earth and more heat absorbed so more ice melts for example.

 

Once we go past a tipping point it'll take an awfully big effort to reign things in.

 

If being greener reduces the risk of this sort of thing it's got to be worth it surely?

 

 

Yes we can say 'X is causing more harm than us so we're ok' but I'm not convinced. If I murder two people does it make it ok for you to murder one?

But 6 of the warmest years of (accurately) recorded history, ie last 150 years, have been in the last 10 years. The industrial revolution has made it's mark ...

 

industrial revolution was begun in the west midlands started over 250 years ago the black country and even leafy sussex / kent were littered with 1000's of forges, factories and charcoal units but its all gone now...yet apparently the UK are worse than ever if you take the green view :wack: ....it is possible the world got warmer because of activity cycles of the molten core, solar activity and the fact we got better at taking the temperature in the last 150 years with more even more accurate equipment...funny thing is how do we know these subtle changes wernt going on when we didnt have the equipment...i'm afraid i dont trust our future prosperity to a few tree rings and some ice core samples as good enough proof...that and the fact the weather guys cant even tell me what the weather will do this time next week let along next centuary...worth mentioning the fact that most historical temp readings were taken in built up area's, cities and around airports hardly sound neutral base level from which to compare temp readings over such a geological short time span

 

but i'll be honest with you if i worked for a enviroment group i'd be saying its getting warmer as a result of man too....because you can get a research grant to cover your wages for the next 20-30 years so its a pretty good incentive to a scientist

 

 

regards to all

 

chris

We've grown rich as a nation through decades of high-polution industry and lifestyle. The problems are in the post. Everyone needs to do their bit.

The worlds temperatures have risen and fallen for millions of years, how do you think ice ages happen. I think statistics are a load of bull ............. and I am not brushing my teeth tomorrow!

if it was that bad then all cars and planes should be banded but they wont. why dont they push for electric or hydro cars cause they are screwing us over for fuel thats why Iraq was invaided for the oil and 9/11 was planned but not by bin larden