Who are these unnamed experts?
How did they collect air samples from contrails tens of thousands of feet up?
Where is the published study?
I'm going to say that since this question has not been answered in 22 years, the European Parliament did not deem it a serious question to answer.
Seriously, any blogger can say anything. Where is the real proof?
The elements of chem trails are from ground sampling after a rain usually, the ontituent eoements are quite strange.All ground has a backgropund level of certain eements. These are detected because the stand out as abnormal after a spraying event.
Suture yourself though. I would not want to stifle any genuine curiosity you might have: