Your cannabis consumption has a carbon footprint, and when everybody's cannabis consumption is added up, that carbon footprint gets mighty big. But most of that climate-changing impact is coming from marijuana grown under lights indoors with extensive heating, air conditioning, and electrical requirements. Marijuana grown outdoors or in greenhouses (or hoop houses) doesn't require any of that and has virtually no impact on greenhouse gas emissions. It would appear that the ethical thing for marijuana consumers to do when it comes to addressing climate change is to consume outdoor, sun-grown marijuana. But that is just for starters. Environmentally conscious consumers can get really serious and demand marijuana that is sun-grown, organic, and produced in a sustainable and regenerative fashion.