Population Global Warming Impact

(1) KNU Definition

This KNU represents the link beweek "unhapiness" and decline in population growth, compared to the current projected trajectory for each country. This is a compositite factor, which is still very primitive in CCEM v8 but will get more sophisticated in future versions. The illustration below explains the reasoning (why does warming reduce propulation growth, or accelerate decline, according to the initial trajectory). Currently the KNU is just a factor that is applied to pain to produce a correction to the population trajectory.

(2) What the slider in G2WS does ?

The slider simply sets the value of this KNU. By default, it is set to zero.

Playing with the slider allows to model a feedback loop. In this crude version, mortality and birth rate effects are combined into one. In the future, we shall sepatate birth and date to account for aging with more precision.

Impact of Global Warming

Global Warming has both an impact on mortality increase and birth rate.

On mortality, there is a systemic effect of poor health because of worse living conditions, and a crisis effect with disasters such as tornadoes, hurricanes, floods, etc.
On birth rate, this is harder to calibrate because we do not know enough yet. There is a well-documented decline in fertility (all over the world) where pollution is one of the suspected factor. There is also a psychological aspect, where the fear of an "inhabitable planet" (and worse economic prospects) is preventing some couples to have children

(3) References

You may also ask your favorite LLM (such as Opus 4.5 or GPT 5.2) to make your opinion.

References to web data sources may be found in this page.

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