Thanks Domenic (source here:http://www.attn.com/stories/2149/order-groceries-online-better-environment).
Whenever I see someone getting their groceries delivered or shopping on Amazon instead of going to a store, I think, 'Wow, that person is lazy.' However, it might be better to start thinking, 'Wow, that person is helping the environment.'
It turns out that having groceries delivered to your house can cut carbon emissions by 20 to 75 percent, according to a 2013 study from the University of Washington.
"The way most people shop for groceries is pretty wasteful," Anne Goodchild, an associate professor of engineering at the University of Washington and a co-author of the study, told ATTN: "You take your 3,000 lbs. of metal and drive it to the store with nothing in it except you, and then you drive it home with some amount of groceries. It's not really hard to do better than that if you're trying to be efficient."