What activities of hunters-gathers altered the environment?

Hunters-gatherers altered the environment primarily through their foraging and hunting practices, which included the selective hunting of large game and the gathering of specific plant species. These activities often led to the overhunting of certain animals, resulting in population declines and local extinctions. Additionally, their use of fire for land management, a practice known as "fire-stick farming," helped shape ecosystems by promoting the growth of certain plants and creating open areas for hunting. Overall, while their impact was generally localized and less intensive than later agricultural practices, hunters-gatherers still significantly influenced their environments.