Global Temperature
Global warming is the global average (land-sea) temperature increase from 1850-1900 (preindustrial)
Alone it is not the best climate Change Indicator
Alone it is not the best climate Change Indicator
Climate Emergency Institute
Global warming is higher :
>in the night-time than the day
>in the night-time than the day
>over land than over sea (sea surface temperature SST )
>over central continents
>in the northern hemisphere and
> highest in the Arctic
(feedback amplification)
>over central continents
>in the northern hemisphere and
> highest in the Arctic
(feedback amplification)
OCEANS Record high ocean heat is increasing at an accelerating rate.
93% of added GHG heat has gone to the oceans, making ocean heat a much better single guide for assessment and mitigation than global surface warming. Global warming varies,with volcanic eruptions, El Nino La Nina phases, while ocean heat does not.
93% of added GHG heat has gone to the oceans, making ocean heat a much better single guide for assessment and mitigation than global surface warming. Global warming varies,with volcanic eruptions, El Nino La Nina phases, while ocean heat does not.
Aspects of global warming
Global warming is average land-ocean temperature, the ocean having a cooling effect.
Global warming is the annual average.
El Nino/La Nina
Global tends to be higher in an El Nino phase and cooler in La Nina
Global warming is average land-ocean temperature, the ocean having a cooling effect.
Global warming is the annual average.
El Nino/La Nina
Global tends to be higher in an El Nino phase and cooler in La Nina
Causes for the big record 2023 and 2024 temperature increases
1. Record atmospheric CO2, increasing faster than ever
2. Record all atmospheric GHGs
3. El Nino
4. Decline of cooling aerosol emissions -
measures have been taken to further reduce fossil fuel
air pollution reducing air pollution sulfate cooling aerosols
1. Record atmospheric CO2, increasing faster than ever
2. Record all atmospheric GHGs
3. El Nino
4. Decline of cooling aerosol emissions -
measures have been taken to further reduce fossil fuel
air pollution reducing air pollution sulfate cooling aerosols
2023 and 2024 rate of warming were unprecedented, Indicators of Global Climate Change 2022, Piers Forster et al
Human-induced warming has been increasing at an unprecedented rate of over 0.2°C per decade. This high rate of warming is caused by a combination of greenhouse gas emissions being at an all-time high over the last decade, as well as reductions in the strength of aerosol cooling.
Human-induced warming has been increasing at an unprecedented rate of over 0.2°C per decade. This high rate of warming is caused by a combination of greenhouse gas emissions being at an all-time high over the last decade, as well as reductions in the strength of aerosol cooling.
Global warming past 1000 years
2023 and 2024 temperature highest
in 125,000 years
in 125,000 years
The Arctic heating has been at twice the global rate, as the science has said for years- From 1980 to 2021 it heated up to 4x as fast as the rest of the planet.
That puts the Arctic amplifying feedbacks and tipping points coming on much faster.
The Arctic holds more carbon, till recently safely frozen, than other region on the planet. Yes - another reason for immediate global emissions decline.
The Arctic heating has been at twice the global rate, as the science has said for years- From 1980 to 2021 it heated up to 4x as fast as the rest of the planet.
That puts the Arctic amplifying feedbacks and tipping points coming on much faster.
The Arctic holds more carbon, till recently safely frozen, than other region on the planet. Yes - another reason for immediate global emissions decline.
Summer warming 2023
We need to know warming in the summer
for heat waves, wild fires and drought
for heat waves, wild fires and drought
Big Record 2023 and 2024 temperatures inceases
2024 was the new record at a huge 1.55°C (no El Nino)
2024 was the new record at a huge 1.55°C (no El Nino)
2023 at 1.45°C before that was a record by a record large margin, boosted by a powerful El Nino
WMO put it at 1.45°C
2023 and 2024 were the highest global temperature in 125,000 years (IPCC AR6)
2023 and 2024 were the highest global temperature in 125,000 years (IPCC AR6)
Global warming is accelerating
The long-term and short-term trends of global warming are accelerating.
Recent global warming from 2010 is accelerating (James Hansen)
Industrial age global warming is extremely rapid- an abrupt global temperature increase
Global temperatures in the distant past
Global temperature is now very high in terms of hundreds of thousands of years.
Global temperature is now very high in terms of hundreds of thousands of years.
Marine heat waves
Ocean marine heat waves are increasing
2023 was a record for marine heat waves
On an average day in 2023, nearly one third of the global ocean was gripped by a marine heatwave, harming vital ecosystems and food systems. Towards the end of 2023, over 90% of the ocean had experienced heatwave conditions at some point during the year
(WMO March 2024, State of Climate in 2023).
Ocean marine heat waves are increasing
2023 was a record for marine heat waves
On an average day in 2023, nearly one third of the global ocean was gripped by a marine heatwave, harming vital ecosystems and food systems. Towards the end of 2023, over 90% of the ocean had experienced heatwave conditions at some point during the year
(WMO March 2024, State of Climate in 2023).
1900, average global temperature:
13.7° Celsius
13.7° Celsius
Global warming is accelerating for sure: March 2026 Global Warming Has Accelerated Significantly,G. Foster, S. Rahmstorf
2023,24,25 track worst-case scenario
Today's global warming increase rate is higher than any natural temperature increase in the entire geological record (4.4-4.6 billion years).
'In terms of global-scale events, in the entire geological record, only the instantaneous Cretaceous–Paleogene meteorite impact event occurred more rapidly than the current human-induced global warming'. That's the extinction event of the dinosaurs by a meteorite 66 million years ago.
( Geological Society of London Scientific Statement: what the geological record tells us about our present and future climate, C. H. Lea et al, Dec. 2020)
'In terms of global-scale events, in the entire geological record, only the instantaneous Cretaceous–Paleogene meteorite impact event occurred more rapidly than the current human-induced global warming'. That's the extinction event of the dinosaurs by a meteorite 66 million years ago.
( Geological Society of London Scientific Statement: what the geological record tells us about our present and future climate, C. H. Lea et al, Dec. 2020)
Arctic Temperature
Arctic temperature is the highest due to Arctic amplification (of global warming) which is from sea ice loss feedback (less reflection of energy)