Correlation is not causation; two quite unrelated factors may correlate well, but have absolutely no physical relationship; so if you look at the chart below there is a great correlation between increases in sea surface temperature and decreases in pirates over the past 150 years or so; and I think you would agree that this a correlation with no causation. If increased CO2 has an impact on life expectancy, which if anything is probably a negative relationship as noted by the message above, the country with considerable CO2 emissions (the US) has just had its life expectancy drop for the 3rd year in a row - see https://www.smithsonianmag.com/smart-news/us-life-expectancy-drops-third-year-row-reflecting-rising-drug-overdose-suicide-rates-180970942/.

Wealth increases both life expectancy and CO2 emissions. There might though be some backlash from air pollution like small particles that decreases lite expectancy. For example during the industrial revolution, but in the long run relationship has been positive.

Proceeding climate change might in the very long runt change this.

NO

No. This is one of those co-incidences that happen sometimes. There is no direct mechanism for increasing CO2 emmissions to increase life expenctancy. The two are only indirectly linked as Jan has said above. Increasing population, industrialisation and wealth lead to increasing CO2 emmissions, not the other way round. Life expectancy increases with increasing wealth and new medical advances (which are possible because we can afford time and money to do research). In the end, increasing CO2 may have the opposite effect as the world's population struggle with climate change and the falling agricultural productivity and shortage of fresh water which will follow that, not to mention the effects of sea level rise which may significantly reduce the land area available to us.

Correlation is not causation; two quite unrelated factors may correlate well, but have absolutely no physical relationship; so if you look at the chart below there is a great correlation between increases in sea surface temperature and decreases in pirates over the past 150 years or so; and I think you would agree that this a correlation with no causation. If increased CO2 has an impact on life expectancy, which if anything is probably a negative relationship as noted by the message above, the country with considerable CO2 emissions (the US) has just had its life expectancy drop for the 3rd year in a row - see https://www.smithsonianmag.com/smart-news/us-life-expectancy-drops-third-year-row-reflecting-rising-drug-overdose-suicide-rates-180970942/.

Type "spurious correlations" into Google and you will find many examples similar to the above where two sets of data show a correlation but there is no causal link between the two. For two phenomena to actually be linked there must be a causal relationship between the two, in other words one change must be causing the other. One example is the correlation between ice cream consumption and the number of people who fall off boats and drown. There is absolutely no evidence that eating ice cream causes more people to drown. Both phenomena are probably attributable to hotter weather which encourages people both to eat more ice cream and mess about in boats. But the ice cream eating is not causally linked to the drownings.

Thanks Valerie Steele Howard J Diamond Luis Bertello Jan Kunnas for sharing your ideas

In this level I am not accepting or rejecting the causal relationship between CO2 and life expectancy.

I am working on it and hope to get something interesting. metabolic activity, O2, CO2, temperature are closely interrelated

Valerie Steele "falling agricultural productivity and shortage of fresh water" are local phenomena. CO2 is a raw material for biological productivity and has positive effect on agriculture. spatial distribution and intensity of rain-fall is changing. some areas getting more and some areas less.

Howard J Diamond U.S. Life Expectancy Drops for Third Year in a Row, Reflecting Rising Drug Overdoses, Suicides

Not CO2

I agree with Jan Kunnas! Also, in a world population of more than 7 billion I am afraid that individuals who end up as statistics in studies of this kind are most likely people who can afford medical and health services. I would argue that in marginal/poor communities of the developing world life expectancy might not have changed, unless an encroachment by a northern corporation has occurred to exploit the resources available there. Reduced life expectancy in the US besides drug overdoses and suicide has to do also with expensive health costs for services that most people cannot afford these days. The rise of inequality due to an unfair distribution of wealth affects (in my opinion) live expectancy in the industrialized world.

Bruno Borsari Thanks. As you told " I would argue that in marginal/poor communities of the developing world life expectancy might not have changed ..." if we can prove this argument (any background reference), it can help us learn this issue more clearly

I never said that the rate of suicide in the US had anything to do with CO2 or not; all I noted was that life expectancy went down; despite that CO2 emissions went up, so it just goes to show what I tried to explain before; one must show great care with making sweeping conclusions related to the correlation of two variables.

This is a funny question. Like Jan Kunnas wrote increased wealth may lead to increased emissions of fossil CO2 due to changes in consumption patterns. Increased emissions of CO2 does however not affect the life expectancy in any way at all.

The really interesting question that needs to be answered in relation to this is how can we learn to live in a way where an increasing amount of people have access to improved sanitation and living conditions, amongst other things (leading to an increased life expectancy), without falling into a behaviuoral change that leads to an increased use of finite and fossil resources?

On a side note: My favourite "spurious causality" is the rising sales of ice-creams during Swedish summers causing an increased number of drownings, every year. Like clockwork.

We just can't seem to swim with a cold stomach...

Niclas Ericsson Thanks for your comments... hope you will give sometime to read attached documents...

What I have shared is just a questions... hope after reading some references you also may feel curiosity.... there is no direct relation... again, what we can see with our eyes are not everything what is happening in nature

you can also try to link CO2, primary productivity, famine, biological metabolism, and lots

It is OK that you think the question is funny...

Niclas Ericsson

Elevated CO2 levels affect development, motility, and fertility and extend life span in Caenorhabditis elegans. Article Elevated CO2 levels affect development, motility, and fertil...

Humans' slow metabolisms explain long life span, study says..

https://www.medicalnewstoday.com/articles/271195.php

No.

Everything is connected.