Seems a little "tinfoil hat" to me, actually. But that's just me.

Great post Freddy 

This is all new to me.

I was thinking It's a mixed bag too, some of the video does seem to be utter rubbish but other bits seem to make a bit of sense, none of it is scientifically proved though, like you said.

They seem to be saying that aluminium is being sprayed out of the aircraft, there also does seem to be a bit of evidence out there that says aluminium levels in water, snow and soil has been increasing. If the two are connected is another matter.

For now I'm going to keep an open mind and try to do a bit more research.

I've known about condensation trails since the 1970's, and have known people since the 1980's who were convinced that the governments of the world are using them to spread all sorts of things from viri to cancer causing agents to mind control drugs and chemicals. In a way, some of that is at least partially true. Not the bit where the government(s) is(are) involved, or about viri or mind control drugs, but the bit about cancer causing agents may have a miniscule basis in fact. After all, jets, both military and commercial, burn jet fuel, which is somewhere between kerosene and diesel fuel in structure. Those petroleum products produce a wide variety of carcinogens when they combust, and since those condensation trails come from the exhaust of these jet engines, it stands to reason that the contrails would contain cancer causing agents. How much they spew, and where they go when the condensation disperses isn't fully understood, I'm sure. I'm also willing to bet that the particulate aluminium that the video mentioned could well have come from commercial and military aircraft, but I'm reasonably certain it didn't come from the contrails. The outer skins of aircraft are made from sheets of aluminium, all riveted together, yes? (yes) as aircraft fly, all sorts of vibrations are going on from front to back, and those vibrations are causing/allowing movement between the various riveted parts, which in turn causes some of that aluminium and other metals to flake off and go tumbling through the air in sub-micron sized particles. the same is likely true for unpainted aircraft parts that are directly exposed to the wind; but this time it's the friction of the air itself that causes tiny particles of aluminium and other metals to ablate from the surface, again in sub-micron sizes. Again, this is most likely not some sort of government plot to make us all political zombies (we do a great job of that all by ourselves, after all), but simply an unexpected/unwanted side effect of using the technology currently at our disposal.

Thanks for your detailed replies chaps 

I've seen these vapour trails all my life, plenty of large aircraft fly over my house but had never heard of chemtrails until recently. The conspiracy theorists think that some years ago other chemicals were added, for whatever reason, I'm not sure the conspiracy theorists even know that themselves.

Anyway I did a little bit of research and can't find any real evidence for chemtrails, obviously these aircraft are putting out pollutants into our atmosphere which isn't exactly a good thing but that's not the chemtrails some would have us believe.

The best scientific research I found was this: 

Chemtrails conspiracy theory gets put to the ultimate test

Until some real evidence comes along I don't believe in chemtrails.
An inquisitive mind never rests.   

Phil Plait sounds about right to my ears.

I'd forgotten about him, just off the Bad Astronomer site to have a gander.

Here are his more recent musings.