Science of Climate Change Essay Ole Humlum
AbstractReal observations show a slight decrease of global temperature in 2025 compared with the previous ten years. Some stations in the Arctic show warming, but most are fairly stable.
The Arctic Ocean is cooling to considerable depth, while the tropical and Antarctic oceans have a slight surface warming.
The sea level trend is not changing as IPCC model data indicate.
The Arctic September sea ice varies but its area has the last 4 years been much larger than modelled by the IPCC.
The average snow cover on the Northern Hemisphere is fairly constant during the last 50 years.
The number of tropical cyclones varies, but with no clear trend. The integrated cyclonic energy shows some periodic variations, but no trend.
Global precipitation has almost zero trend.
The global cloud cover decreased from 64 % to 61 % from 1985 to 2020. At the same time the global temperature increased 0.7 C, suggesting a possible relation.
The observed sequence: first warming the of the sea surface, then the deeper sea, atmosphere and land suggests that the Sun is the source of warming, modulated by clouds, and there is no manmade climate catastrophe in theforeseeable future
1. IntroductionThe United Nations Secretary General, António Guterres on July 27, 2023, declared: The era of global boiling has arrived. We have a huge climate crisis.
There is a good reason to study the available climate data to see if that is true.
In the following we will compare data for 2025 with previous years and look for trends of this claimed extreme warming and accompanying weather extremes.
We found no sign of a coming climate crisis.
Before I started this survey, I asked my helpful AI to make some images illustrating a) Changing Climate, b) Natural climate change, and c) Good climate change and d) Man made climate change.
The pictures are shown on the next page.
They give a good idea of what the public is told about climate and climate change and that mankind is destroying it, as stated by the UN Secretary General.
In this extended abstract I present a short status for the atmospheric and ocean temperatures, sea level, sea ice, sea level, snow, wind and storms, precipitation and global cloud cover.
My talk can be seen at
https://www.youtube.com/watch?v=85puIDVyBgc.
Monthly updates of climate data are available at my website:
www.climate4you.com.
A crucial parameter is the change of the global temperature. Usually, it is compared with a fixed 30-year average, which changes every 30 years.
The last one is from 1990-2020. Since this becomes more and more in the past, and is hard to remember for ordinary citizens, I prefer to compare with the last 10 years which is shown in Figure 2.
The average change is -0.24 C and is more a sign of cooling than warming.
A warning: The use of just one number, the average change in global temperature, hides the fact that our planet has various temperature regions which may show a different change than the average.
In 2025 we observe that the Southern Africa has cooled 3.4 C, while Greenland and Northeast Canada have warmed 3.0 C.
The use of averages tends to hide important details.
More:
https://scienceofclimatechange.org/wp-content/uploads/SCC-Vol.6.1-07_Humlum.pdf
