The United Nation's Intergovernmental Panel on Climate Change (IPCC) consists of the World Meteorological Organization (weather forecasters), and the United Nations Environment Program (environmentalists).
These organizations focus on wild guesses of the future climate, going out 100 years … and they generally ignore Earth's 4.5 billion year climate history.
The UN requires the IPCC to focus on:
“a change of climate which is attributed directly or indirectly to human activity that alters the composition of the atmosphere, and which is in addition to natural climate variability.”
So the IPCC mandate is to blame humans for a coming climate catastrophe -- and if they didn't do that, they wouldn't need to exist.
Each IPCC Summary for Policymakers is agreed “line by line” by politicians, or their representatives, before being published.
After that the so-called ‘scientific’ back-up reports are changed to agree with the Summary and released months later so the press will ignore them (not that the mainstream press ever does more than paraphrase and quote the IPCC press releases).
Every IPCC report "predicts" the future climate by falsely assuming carbon dioxide (CO2) is 'the climate controller'.
Then they assume manmade CO2 will be added to the atmosphere (which is true), but at a rate they pull out of a hat, and then they falsely assume a minor warming effect from more CO2 in the air (an unproven theory, but works in laboratories), will be greatly amplified by a positive feedback from water vapor in the air, and together they will cause runaway warming (an unproven theory contradicted by Earth's climate history).
Runaway warming is the bizarre assumption that CO2 causes warming, and warmer oceans release more CO2 into the air, which causes even warmer oceans, which release even more CO2 … leading to runaway global warming.
This is nonsense, but it does scare people, and scared people are much easier for governments to control, and dominate!
The alleged coming climate change catastrophe is primarily a political tool used by leftist politicians to seize more power over their economies -- and has almost nothing to do with real science.
Geologists believe CO2 was higher than today for the first 4 billion years of Earth’s 4.5 billion year history.
Average temperature and CO2 levels have moved in the opposite direction as often as they moved in the same direction.
During the Devonian Period beginning 400 million years ago plants evolved to grow tall, in competition for sunlight.
Trees died on top of one another until they were at least 100 meters deep, making great coal beds (sequestered carbon that built up for 90 million years).
Estimated temperatures from climate proxy studies show we've been in a cooling period since the Eocene Thermal Maximum 50 million years ago, when the entire planet was ice-free.
Earth was an average of at least 15 degrees C. warmer back then … yet the ancestors of every species living on Earth today survived that hot weather.
Glaciers began to form in Antarctica 30 million years ago, and 3 million years ago in the Northern Hemisphere.
Today we have one of the coldest climates in Earth’s history.
Climate proxy studies of Antarctic ice cores show the past 800,000 years have had 100,000 year cycles of major glaciation, followed by interglacial periods.
These "Milankovitch" cycles coincide with the eccentricity of the Earth’s orbit and its axial tilt.
There was a strong correlation between temperature and CO2 levels -- during the past 400,000 years, CO2 level changes LAGGED temperature changes by an average of 800 years.
That means rising temperature is the CAUSE of rising CO2 in the air, not the RESULT of more CO2 in the air.
20,000 years ago, 95% of Canada was covered in a sheet of ice.
Sea level was about 120 meters lower than today.
7,000 years ago all the low-altitude, mid-latitude glaciers had melted, and not because of coal burning power plants, and SUVs burning gasoline.
Temperature has risen at a steady slow rate in Central England since 1700 -- the River Thames froze for the last time in 1814.
There was global warming from 1910-1940.
There was global cooling from 1940 to 1970.
There was global warming from 1970 to 2000, and that warming was very similar to the 1910 to 1940 global warming.
The IPCC says the 1910 to 1940 global warming was natural climate variations … but the similar 1970 to 2000 global warming was caused by manmade CO2.
That IPCC claim is malarkey, banana oil, baloney, bull excrement, etc. (your choice)