Several studies have shown that moral licensing by observers makes observers more lenient in their judgment of subsequent immoral behaviors committed by a person. Environmental behavior is generally perceived as moral behavior, but it is not known whether it can trigger moral licensing by observers.
In two pre-registered experimental laboratory studies (N-1 = 198, N-2 = 501), we have tested whether prior engagement in pro-environmental behavior triggers licensing by observers and thus makes observers judge more positively actors' subsequent immoral behavior (Study 1) and their subsequent anti- and pro-environmental behaviors (Study 2). We found that people engaging in pro-environmental behavior were subsequently rated as more pro-environmental and moral, and their subsequent pro- and anti-environmental behaviors (but not outright immoral behavior) were rated as more moral by observers.
As these effects also concern subsequent pro-environmental behaviors, they are broader than what licensing theory suggests.