1) Many readers pointed to a story on a study about the effect of posting calories in fast food restaurants. Customers noticed the signs and thought they influenced their orders. But they actually ordered food with more calories. Reader Paul Zurawski wonders if customers would have eaten healthier if they had been asked to sign a receipt acknowledging their choices and calorie counts.
3) Google’s PowerMeter now works with a handheld device that starts at about $200. What this means is that you would not need a utility company to install a smart meter in your building. Hat tip: Christopher Daggett.
4) The San Francisco airport has begun selling carbon offsets at the electronic check-in kiosks. Philip Frankenfeld has many catchy slogans for this nudge including “Pay dime. Help clime” and “You are now free to roam around the carbon”.