Guy Callendar

Guy Stewart Callendar (1898 - 1964) | Discovered global warming in 1938 & suggested that increase in atmospheric CO₂ was partly responsible.

[Guy Callendar @GuyCallendar]

If you want to learn more about Guy Callendar's many contributions to climate science then come over to BlueSky: https://t.co/XHe62jMV1D

[Ed Hawkins @ed_hawkins]

A new article about @GuyCallendar and how his ideas did not receive widespread acceptance for several decades.

https://t.co/UPnO0TCuKG

[Ed Hawkins @ed_hawkins]

86 years

In April 1938, @GuyCallendar published his seminal paper showing that Earth’s land areas had warmed over the previous 50 years.

He also suggested that man-made CO₂ emissions had caused around half of the observed warming.

86 years ago.

https://t.co/AfIXXeYeiJ

[All Our Yesterdays @our_yesterdays]

November 19, 1960 – Guy Callendar gives advice on unpopularity of C02 theory of climate change.

https://t.co/YsWxd6ivs4

[Richard Allan @rpallanuk]

@ClimateDann @StottPeter Well, @GuyCallendar did some basic but pretty innovative detection & attribution in his day!

[Guy Callendar @GuyCallendar]

I like this line:

“And as long ago as 1938, the burning of fossil fuels was linked to the observed rise in both carbon dioxide levels and global temperatures.”

[Ed Hawkins @ed_hawkins]

The demand for no new licenses for UK coal, oil and gas projects is consistent with the science underpinning the international agreements that the UK has signed.

https://t.co/VVCVR3oqtM

[Guy Callendar @GuyCallendar]

@flamptiton @RishiSunak No - the effect of aerosol emissions (which caused the slight cooling) was not known at that time.

[Guy Callendar @GuyCallendar]

Hi @RishiSunak - did you know that an English engineer (yours truly) first demonstrated in 1938 that burning fossil fuels was causing temperatures to rise all across the world? Might be relevant today.

[Guy Callendar @GuyCallendar]

Hi @RishiSunak - did you know that an English engineer (yours truly) first demonstrated in 1938 that burning fossil fuels was causing temperatures to rise all across the world? Might be relevant today.

[Prof. Stefan Rahmstorf 🌏 🦣 @rahmstorf]

@ed_hawkins @GuyCallendar I sometimes show this in my public talks. It is important to talk about the history of climate science. Callendar was able to compute a contribution from the CO2 effect, because Arrhenius and others had already calculated how sensitive global temperature is to CO2 changes.

[Ed Hawkins @ed_hawkins]

Since the 1860s the science community has understood that adding more carbon dioxide & other greenhouse gases to the atmosphere would warm the climate. In 1938, @GuyCallendar first linked the burning of fossil fuels to the observed rise in CO₂ levels & global temperatures.

[Ed Hawkins @ed_hawkins]

It is:
- more than 200 years since Fourier first made the analogy that the atmosphere behaves like a greenhouse
- more than 150 years since Foote & Tyndall identified the main greenhouse gases
- 85 years since Callendar showed the planet was warming & caused by increases in CO₂

[Jenny Jones @GreenJennyJones]

On the issue of our #ClimateEmergency, I always say "blah, blah, @TheGreenParty has been saying this for 50 years", but we were 35 years behind @GuyCallendar

[Andrew Dessler @AndrewDessler]

@ed_hawkins @GuyCallendar I'm amazed how far back the conspiracy to destroy the world economy goes

[Ed Hawkins @ed_hawkins]

@metofficece @GuyCallendar Indeed! Figure 1.8 from IPCC AR6 WGI shows how comparable (over land) Callendar's estimates were with modern reconstructions of the same period:

[@MetOfficeCE @metofficece]

@ed_hawkins Shows just how good @GuyCallendar was that he picked up the trend in the 1930s. Really couldn’t have been done any sooner.

[Leo Hickman @LeoHickman]

I spent a very fun hour chatting to @plumb_pud and @WeatherAisling for their @4loveofweather podcast.

We ranged across lots of topics inc what we do at @CarbonBrief and even the work of @GuyCallendar (via @ed_hawkins)

Listen here ->
https://t.co/9HK7o75jZm

[Guy Callendar @GuyCallendar]

@percy_bloom Would love to be able to use this amazing reanimation offline if possible please (with appropriate credit of course)? Thanks!

[Guy Callendar @GuyCallendar]

A mention in 1956 for my research on the effect of carbon dioxide on global temperatures!

[Guy Callendar @GuyCallendar]

A mention in 1956 for my research on the effect of carbon dioxide on global temperatures!