## 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