Desc: The Nature of Things: Save My Lake: Directed by Jeff Newman. With David Suzuki. Lake Winnipeg is a 25,000 sq/ km "inland sea". It is bigger than Lake Ontario and about the same size as Lake Erie -- and it is in deep trouble. This once pristine lake has the worst blue-green algae problem of any major lake on the planet. Yet few people have pinpointed the cause of the lake's malaise, and even fewer (including the public and politicians) know what to do about it. What in the world is killing Lake Winnipeg?