By Seth Millstein, Sentient Media Change is hard — but does it have to be? An increasingly popular school of thought over the past few decades argues that it doesn’t, and that with the right approach, people can easily and painlessly enact behavioral changes that are good for them and good for the environment. This approach is called a nudge, and on the surface, it’s very appealing. But are nudges all they’re cracked up to be? Nudge theory, a te…