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abakus | 5 years ago

How much of the global warming can be explained by this increased sun activity?

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smitty1110|5 years ago

Almost none [1]. In theory, solar radiation has been decreasing a bit, so we should have cooled slightly over the past 50 years.

[1] - https://climate.nasa.gov/faq/14/is-the-sun-causing-global-wa...

bumby|5 years ago

Is the little hump inn temperature in the 1940s interpretable? Is it possible this is from the mass industrialization during WW2?

refurb|5 years ago

So the sun is more active but irradiance is decreasing?

techload|5 years ago

From the article, at the very end: "Whether this effect could have provided a significant contribution to the global warming of the Earth during the last century is an open question. The researchers around Sami K. Solanki stress the fact that solar activity has remained on a roughly constant (high) level since about 1980 - apart from the variations due to the 11-year cycle - while the global temperature has experienced a strong further increase during that time. On the other hand, the rather similar trends of solar activity and terrestrial temperature during the last centuries (with the notable exception of the last 20 years) indicates that the relation between the Sun and climate remains a challenge for further research."

throwaway189262|5 years ago

It would be nuts if high solar activity spurred abundant food and thrust humanity into the electrical age. There's gotta be some big trigger why we suddenly have all this tech within 200 years after 100k years of modern humans walking about as cavemen

keithnz|5 years ago

keeping in mind that was in 2004 and a bunch of further research has happened.

sleepysysadmin|5 years ago

A very large portion, not all, not little.

https://en.wikipedia.org/wiki/Solar_cycle#/media/File:Sunspo...

Notice the Modern Maximum starting around ~1800 which is also when all the graphs of global warming show increases; whereas normally the industrial revolution is blamed.

Maunder minimum -> https://en.wikipedia.org/wiki/Little_Ice_Age

Medieval maximum -> https://en.wikipedia.org/wiki/Medieval_Warm_Period though our data is far less clear about that period of time.

Fundamentally, you can look at this graph. https://en.wikipedia.org/wiki/Geologic_temperature_record#/m...

The climate warms and cools quite regularly. The Earth warmed 6 celcius over the last 20,000 years without our help.

https://en.wikipedia.org/wiki/Eemian about 115,000 years ago it was 1-2 celcius warmer. Which is roughly what is currently being predicted as part of climate change by 2100.

pacamara619|5 years ago

An absolutely tiny and negligible amount, almost immeasurably small.