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3 Min Read LONDON (Thomson Reuters Foundation) - Is a beer, a cup of coffee or a spliff more damaging for the climate? If the cannabis is cultivated indoors on a commercial scale, the answer is probably the joint. That’s the finding of researchers at Colorado State University who say booming indoor marijuana production in the United States is a major and growing source of greenhouse gas emissions that cause global warming. The $13.6 billion industry has nearly quadrupled since 2012 when Washington and Colorado became the first states to open the doors to recreational use. But policymakers and consumers have largely ignored the environmental cost of energy-hungry indoor cultivation, the researchers said in a study.

United statesColorado state universityCity ofUnited kingdomKaty migiroHelen popperEmma bathaJason quinnThomson reuters trust principlesThomson reutersThomson reuters foundation onSustainability research laboratoryThomson reuters foundationSustainability researchThomson reuters trustClimate change