Beaver Lake in Vancouver's Stanley Park was predicted to fill in and become a meadow in a couple thousand years. Then it was predicted to be filled by 2020. But

Beaver Lake in Vancouver's Stanley Park was predicted to fill in and become a meadow in a couple thousand years. Then it was predicted to be filled by 2020. But it's not. It might be soon. In ten years or maybe a hundred years. We're just really bad at predicting such things accurately. In the case of Beaver Lake, it'll probably get dredged and predictions will become moot.