Prof. Sam Lawler@remiboucher talking about Mont Megantic dark sky preserve: greenhouses are a HUGE source of light pollution in Quebec now (One really big one near observatory for cannabis?! Went out of business)
Problem: regulation for outdoor lightning, greenhouses are lit up INSIDE. Can be 100x brighter than Montreal!
Blackout curtains are the best solution to greenhouse light pollution, but owners need to be educated - even better, need regulations, now adopted for new builds
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