McChicken vs. Big Mac: Could environmental labels transform American burger culture?

Could ordering a McChicken, as opposed to a Big Mac, help in the fight against climate change?

To fend off the disastrous effects of global warming, many people have been willing to trade in their gas-guzzling cars, install solar panels on their roofs or dial down their energy use.

But on any given day, more than a third of Americans find themselves eating fast food, which serves up a significant portion of climate-burdensome red meat. What customers decide to order may be a matter of personal preference, but experts say it has tremendous implications for the amount