1. overfishing : deplete the stock of fish in (a body of water) by excessive fishing.
overgrazing : excessive grazing which causes damage to grassland.
2. Levels of water quality and sanitation in Indigenous Peoples' lands are generally low. Even where Indigenous Peoples have access to treated or piped water, this water is often of poorer quality than in other areas. For example, 20% of all drinking water advisories in Canada are in indigenous communities, who only make up 5% of the country's population.
