It's often tough to prove geoengineering, because contrails and chemtrails look so similar and when someone starts raving about all trails being chemtrails, it only serves to make all the evidence look a bit crazy. As Phoenix says, contrails disperse over the course of about half an hour, whereas chemtrails just spread and linger for the rest of the day.

Then clouds themselves can take on some pretty amazing forms. In cooler countries where there are often clouds it can be a tough call to distinguish whether it's vapour or chemical. These photos certainly make it a tough call, because there is plenty of movement in the clouds happening. Although the smoky haze is odd looking. I'd be thinking bushfires if it wasn't in Canada!

We don't get chemtrails in South Australia, but @andyfishman photographed some very interesting rainbow clouds over Canberra in Australian Capital Territory, so I'm guessing the country is not immune.

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