World wide is probably too strong a claim, but I think here's something to this. However, I think this would work in Amazon's favor. It would make warehousing quite a bit more expensive and would be a significant barrier to competitors. AWS provides them with deep pockets, and the have a huge advantage in logistics so I think they could eat the cost and keep moving. It would also suck a lot of air out of the anti-amazon movement, such that it is. One day delivery with high labor standards might be the pitch that catapults them to real market dominance.