The “first man standing” is recognized by science to be 7 million years old, although many say that humans became people about 70.000 years ago when they started to leave evidence of art and caring for the deads. Modern man (Homo sapiens, in italica), about 15 to twenty thousand years of age. Besides bones, that will be fossils some time, as other living organisms have left, man will leave a collection of man-made artifacts, as well as the result of its actions and intervention over the environment, wars and more.
What do you thing is the most likely human footprint mankind will leave on the planet when we will be just another species who passed by thru the geological history of earth? How much will it last?