Can you break down this sentence? "Another chink in the locavores' armor involves the way food miles are calculated. To choose a locally grown apple over an apple trucked in from across the country might seem easy. But this decision ignores economies of scale. To take an extreme example, a shipper sending a truck with 2,000 apples over 2,000 miles would consume the same amount fuel per apple as a local farmer who takes a pickup 50 miles to sell 50 apples at his stall at the green market." I don't know what it means.