From Globalnews.ca:

Lawyer Robert Shirkey says the warning labels on [gas station] nozzles would be similar to those found on cigarette packages and would act to warn users of the negative effects of fossil fuels.
“The future of the planet is literally in the palm of your hand (when you pick up the nozzle),” Shirkey, founder of Our Horizon, told an audience Thursday at the Centre for Social Innovation in Toronto.
“A lot of people won’t like seeing them but the placement is important because it speaks to diffusion of responsibility,” he said. “Collectively, we’re endangering the planet.”
The labels state that demand for fuel products may harm wildlife, damage ecosystems, cause drought and famine, cause anxiety and depression in children, and put 30 per cent of species at risk of extinction.
Pictures of at-risk arctic caribou, starving families in Africa, and a sad child looking at his own reflection accompany the warnings.
“Imagine if we see these labels every time, how long will it be before we demand more from government institutions,” said Shirkey.

Give me an alternative to using gasoline, then you can lecture me.  Convince me that we lowly citizens who are just trying to survive, are more culpable than large companies that float cargo ships and expend jet fuel.  And good luck getting that more from government you demand.  A pie in the face of an elected official gets more reaction than ten thousand little sticker cultists ever will.

A label telling me I'm a bad person for buying gas when I don't have any choice will cause me anxiety and depression.  These labels will even cause some people to act out and waste gas or rebel against good conservation suggestions.  Shirkey's idea = part of problem.  Not eco-prop at all but part of the web of programming intended to make us hurt ourselves and others before we can actualize.