A figure showing the comparison of the Earth, the thinness of the troposphere and the height of the International Space Station, with the Earth's diameter and the time it would take it you could drive 18km straight up at 56kph (not to scale) (black pen and colored pencil)

80% of the atmosphere by weight is in the troposphere

6km high/deep at poles, 18km high/deep at equator

The highest flying bird gets to 11,000 m up, higher than an airliner

Above that are only very thin aeroplankton

The overwhelming mass of living things on land and air are within about 100m of the surface

How can the atmosphere be too big to change when it's only 1/2 the thickness of a sheet of paper?

Our planet's heat circulation system is thin and delicate

At 16 people per square kilometer burning fossil fuels at 17,500 kwh per person per year it's very much changeable

5 tons of CO2 per person, 80 tons per km^2 per year