View Full Version : European Parliament: question on aircraft condensation trails which no longer only co

6th April 2010, 20:04
Hi Guy's,

I found this to be quite interesting. What are your views? Will some serious questions be asked, or as I feel more likely, nothing done again when we consider this is the EU!



6th April 2010, 20:11
I doubt it but you never know...........


6th April 2010, 20:21
Irishspirit - I just read that article too- then looked up the Parliamentary reply. It was back in 2007

Parliamentary questions
26 June 2007
Answer given by Mr Dimas on behalf of the Commission
1. The Commission is aware of claims that such trends and phenomena exist. However, the Commission is not aware of any evidence substantiating such claims. The extent to which aircraft condensation trails form and the speed at which they disappear are in the first instance determined by pressure, temperature, and the relative humidity of a given flight level. Fuel and combustion properties and the overall propulsive efficiency may also have an impact. Any changes or trends in the extent to which contrails are reported to remain visible and develop into more widespread clouds may thus be due to factors such as changes in:

— meteorological conditions;
— traffic volumes;
— jet-engine efficiency.
2. The Commission is aware of such claims but is not aware of any evidence that particles of barium, aluminium or iron are being emitted, deliberately or not, by aircraft.

3. No. It cannot be precluded that the release of such particles might affect precipitation and climate change, but as indicated above the Commission is not aware of any evidence that such releases take place.

4. The Commission is not aware of any evidence that such methods are being employed in Europe.

5. None of the substances referred to are hazardous per se, but some effects on environment and public health can not be ruled out if large scale releases to the air occurred.

6. As indicated above the Commission is not aware of any evidence suggesting that there is any reason to act

Then I read this:

which lead me to this site:

6th April 2010, 20:21
sorry- it told me it hadn't posted and to try again, and there it was twice, sorry.

6th April 2010, 20:48

thanks for that. I couldn't find any answers, and bingo, you get it in one. The answers are not really that much of a shock are they?