That is post-agricultural revolution humanity. Sure it is ancient by the standards of an individual, but it is only a relatively recent and small part of the more than 100 thousand years of human pre-history.
Okay but humans did this in a ton of environments pre-agriculture. The Amazon was a large grassland with patches of forest that tribal peoples shaped into a giant rainforest over time. This is thought to be the case with tons of places in the old world as well. Humans have been doing mega engineering type stuff for at least 20-30000 years