This does not give me a lot of optimism: "Last year, Apopo received international funding of $4.5m (£2.7m) from various donors and cleared 618 acres of mined l

This does not give me a lot of optimism: "Last year, Apopo received international funding of $4.5m (£2.7m) from various donors and cleared 618 acres of mined land in Mozambique." There are 640 acres in a square mile, so this is like $5 million per square mile cleared.