In these days the pre-industrial city in America functioned as a complex and varied organizing element in American life, not as a simple, homogeneous, and static unit.

You may bring global temperatures back to pre-industrial levels, but the risk is that the poles will still be warmer than they should be and the tropics will be cooler than before industrialisation.

The Cancun agreements saw all nations pledge "urgent action" to keep temperatures from rising no more than two degrees Celsius (3.6 Fahrenheit) above pre-industrial levels.