Most americans, where the bs that is chemtrails originated, do not live near the flightpaths of planes, rarely look up and/or are functionally illiterate and so near-totally scientifically illiterate.

If an american looks up and sees a line in the sky, someone is ‘trying to poison them’. This is do dumb on so many levels it is a joke.

Oft Repeated but CORRECT explanation;
The wingtips of planes disturb the air as they pass through it.
IF the air is at the right temperature and humidity, that is enough for ice crystals OR water droplets to start a CASCADE of ice crystal OR water droplet formation and so cause the moist air to start to form clouds… just like real clouds form PLUS the exhaust of the jet engines produces similar tiny particles around which ice crystals OR water droplets form so seeding the atmosphere with tiny particles that cause NORMAL ice crystals OR water droplets (clouds) to form in a line WHERE THE PLANE HAS FLOWN. Air can have water in it and be transparent… making it look like something came from nowhere… but the water was already there just spread out UNTIL the plane causes it to start to condense into clouds.

Nothing special… they’re called ‘clouds’.

If you never did real science at school or think magic jesus makes things happen because you have lived all your life on an american farm and think you know how the world works, then all this planes=chemtrails bs may seem plausible. But then that will be because you are a dummy and an ill-educated know-nothing who cannot see how clouds form so ‘the Man’ is trying to ‘get ya’.

Tip for the future; Learn to read then read more. With luck you’ll study Physics as I did and if you are really lucky, you’ll stop being a loon.

On a clear day, these clouds can form IF the air is ready to form clouds but it takes the simple distrurbance by the plane (wingtips PLUS exhaust partticulates) to trigger it.

Nothing special. Nothing to worry about. No poison involved.

Sadly, americans and similar ill-educated, unobservant and thought-free individuals decide that ‘the Man’ is out to poison them.

It’s sometimes fun to laugh at the ignorant but ultimately there are too many of them and I have other things to do so if you ‘believe’ in ‘chemtrails’ please seek medical help for your mental illness and do try to enjoy the rest of your life.

Peace… now peace off!

I mean, if they (the evil rich people) wanna use some chemical, why after successfully dealing with all possible unimaginable problems on earth, they wouldn’t use some invisible chemical – why use such which whole world can so easily see and question.

Second thing: injecting some poison into atmosphere is highly unpredictable deed, you don’t know where this poison will end up, – I mean even some rich and evil “genius” who wanna kill mayoralty of earth’s population still lives on this earth. And there’s no guarantee this _poison_ won’t end up in their garden.

Now, to put it simple, everyone who drove with a car in a cold early morning saw, that out of cars’ exhaust white smoke is coming, right? Now keeping this in mind, consider the altitude on which airplanes are flying (and temperature up there), amount of fuel used by them and speed with which they’re flying – and imagine what the result would be.

There’s no denying though that aircraft are causing big pollution: http://en.wikipedia.org/wiki/Aviation_and_the_environment