What if you stacked all 8 billion people on top of each other? How big is the mountain?
An average human displaces about 0.07 cubic meters (we're mostly water, which has a density of 1000 kg/m³). Multiply that by 8 billion people and you get roughly 800 million cubic meters.
That's a cube about 920 meters on each side. You could fit the entire human race into a pile smaller than the Burj Khalifa is tall. All of us — every politician, every artist, every farmer, every child — would fit in a single small hill.
For scale: a single hurricane releases more energy in one second than all humans have produced in all of history. The Earth doesn't even notice us.