When Al Gore was caught running up huge energy bills at home at the same time as lecturing on the need to save electricity, it turns out that he was only reverting to “green” type. According to a study, when people feel they have been morally virtuous by saving the planet through their purchases of organic baby food, for example, it leads to the “licensing [of] selfish and morally questionable behaviour”, otherwise known as “moral balancing” or “compensatory ethics”. Do Green Products Make Us Better People is published in the latest edition of the journal Psychological Science. Its authors, Canadian psychologists Nina Mazar and Chen-Bo Zhong, argue that people who wear what they call the “halo of green consumerism” are less likely to be kind to others, and more likely to cheat and steal. “Virtuous acts can license subsequent asocial and unethical behaviours,” they write.

How going green may make you mean

While I hope I’m not guilty of this kind of thing (and I am, I shouldn’t wonder, at least to some degree), I have certainly experienced this among acquaintances who strive for green living — stuff like “I don’t have children, so I can eat whale and jet around the world in search of the perfect piece of hamachi.”