Occasionally, I hear someone ask which shipping company is the most environmentally conscious. Look, the answer is simple. If you want to ship something in a “green” manner, just mail it. Why? Because the mail truck would have gone to the destination regardless.
Mail trucks deliver mail to the destination every day except Sunday, while most delivery services follow the same schedule but only travel to the destination when they have a package to deliver. No matter what kind of fuel they use or how high-tech their trucks are, two trucks will always release more carbon emissions than one truck, so choose the one that already has to visit the destination.