The authors admit there is no causal relationship established between pollutants and depression. It's pure correlation. I don't understand how nebulous studies

The authors admit there is no causal relationship established between pollutants and depression. It's pure correlation. I don't understand how nebulous studies like this even get published. Still very convenient that we have yet another reason to abandon fossil fuels. Almost starting to feel like a trendy scapegoat and honestly an irrelevant comment given the total uncertainty behind the relationship. But the Guardian made clear it's bias when it advertised for funding with a giant banner claiming "Trump must be impeached.". This isn't objective, fact based journalism, it's propagandist advocacy journalism.