> There's a subtle difference in examining the actual footprint of a human body, versus the environment that exists to support the humans.

Rule of thumb, human body footprint is negligible. The top 10% wealthiest humans account for 50% of GHG emissions, and top 1% account for 15% of GHG emissions. (See https://www.oxfam.org/en/press-releases/carbon-emissions-ric...)