As Jasmin noted earlier, "Your average quarter pounder, siphons 600 gallons of water, 1.2 pounds of feed grain, and 6 square feet of former prairie land—plus the loss of five times the patty's weight in topsoil—even before it gets slapped on a grill." Collin noted that a cheeseburger has a carbon footprint of about 6.5 pounds of emissions.
So what are they doing in Japan? The Environment Ministry and McDonalds are giving half-price Big Macs to people who pledge to fight global warming. So many people took up the offer that the website crashed.