A study [pdf] by U of T researchers Nina Mazar and Chen-Bo Zhong purports to show that people who purchase green products behave less altruistically. [P]eople act more altruistically after mere exposure to green products than after mere exposure to conventional products. However, people act less altruistically and are more likely to cheat and steal, after purchasing green products than after purchasing conventional products UK Guardian columnist James Baggini thinks he know why: The general truth lurking behind these findings is that the feeling of being pure is a moral contaminant. In ethical terms, the best never think that they are the best,...