The idea that driving an electric car and buying fair-trade coffee makes you a good person is grass-fed bull crap, according to psychologists at the University of Toronto.

People who buy “ethical” products are more likely to cheat and steal, according to Do Green Products Make Us Better People, a study published in Psychological Science.

“Purchasing green products may produce the counterintuitive effect of licensing asocial and unethical behaviours by establishing moral credentials,” the report states.

In other words, people who spend money on green products may climb on a moral high horse and excuse their bad behaviour elsewhere because they feel they’ve built a stockpile of do-gooder points.