The KNUs (Key Known Unknowns) are the main input parameters to a CCEM simulation.

A KNU represents a key belief or uncertain parameter about how the Earth system (energy–economy–climate–society) might behave in the future. These are quantities that scientists know are critical, but for which there is no consensus value — they depend on assumptions, not measurements. CCEM is designed to make these beliefs explicit, allowing users to explore how different assumptions change the system’s evolution. In the web simulator (G2WS), the bottom-left sliders let you change these KNU values directly to see how they affect outcomes such as GDP, emissions, and temperature.

You may find more about KNUs in this specific page.

If your are using the G2WS Web interface, a slider allows you to modify the input KNU in a simple way (one dimension).

These are the main (currently eight) KNUs that you can modify. Each of them has a web page that can be accessed directly through the simulator.

1. Oil & Gas Reserves

2. Renewable Growth

3. Electrification

4. Damage Intensity

5. Adaptation Efficiency

6. Productivity (impact of warming pains on labor productivity)

7. GDP Energy density 

8. ReturnOnInvestment