when a mind of land receives more land than it can want , a drain occurs
irrigated_land is cultivable_land. earth has not more_water_than_land fate_of_commons is not important_issue. irrigated_land is not cultivable_land. irrigated_land is unnatural_thing. revenue_land is not land. earth has more_water_than_land fate_of_commons is important_issue. world has more_water_than_dry_land irrigated_land is not unnatural_thing.