Global Warming Science or Lies?

So, how did the proposition of global warming come about? What are the controversies?

Fourier proposed "greenhouse effect"

To explain this, let's start with an incident that happened nearly 200 years ago.

French scientist Joseph Fourier suffered from myxedema, a condition that made people feel cold all the time, while traveling with Napoleon in the Egyptian campaign as part of a regiment of scholars.

After returning to France, he wore a coat throughout the year and spent most of his time studying heat transfer. The question came to him: As sunlight hit the Earth's surface and warmed it, why didn't the planet continue to heat up until it was as hot as the sun itself?

Fourier's answer was that the heated surface emitted invisible infrared radiation, sending the heat back into space. But using his new theoretical method to calculate the effects of radiation, he found temperatures well below freezing - much colder than the actual Earth.

Fourier realized that the gap was caused by the Earth's atmosphere, which intercepts some of the infrared radiation emanating from the surface and prevents it from escaping into space. This has been likened to the "greenhouse effect". In 1824, he published his paper, "An Overview of the Temperature of the Earth and its Outer Space," on this matter.

Dundahl discovered greenhouse gases

At the time, however, most scientists believed that infrared radiation could penetrate all gases.

In 1859, British scientist John Dundahl decided to test it in his laboratory. He proved that infrared light could indeed penetrate oxygen and nitrogen, the main gases in the atmosphere.

Just as he was about to give up the experiment, it occurred to him to try it with gas. Gas, produced by heating coal for lighting, was available in his laboratory. Dundahl found that,

like touching a board of wood, infrared radiation could not penetrate the gas. Dundahl went on to experiment with other gases, and he found that carbon dioxide was also impenetrable - a gas we now call a "greenhouse gas."

Although the amount of carbon dioxide in the Earth's atmosphere is only a few parts per million, Dundahl noticed that this tiny amount of carbon dioxide can change the entire balance of heat radiation in the atmosphere.

In further studies, it was found that water vapor, the more abundant greenhouse gas in the atmosphere, easily blocks out infrared light. Dundahl said: "Steam is to the plants of England like a blanket,

more important than clothing to man. Remove this steam from the atmosphere even for a single summer night, and the next day the sun will shine on an isolated island tightly wrapped in frost."

Arrhenius's complex calculations

In 1896, the Stockholm scientist Suvant Arrhenius posed this question. He said that if the amount of carbon dioxide in the atmosphere changed, for example, a volcanic eruption could spew out a large amount of the gas,

which would cause a slight increase in temperature, but that small increase could have serious consequences - warmer air would retain more water. Because water vapor is a truly powerful greenhouse gas, an increase in humidity would greatly contribute to warming.

Conversely, if all volcanic emissions happen to stop, the carbon dioxide will eventually be absorbed into soil and seawater. Cooling air will retain less water vapor. This process could evolve into an ice age.

Cooling reduces water vapor in the air, less water vapor leads to further cooling, and cooling leads to further less water vapor in the air... This self-reinforcing cycle is what we call "positive feedback" today.

This is just a theoretical model. So can you give a quantitative calculation, that is, a certain amount of carbon dioxide on the Earth will change the temperature of the Earth?

Clearly, this complex effect is beyond anyone's computational power. However, Arrhenius immersed himself in boring numerical calculations for years.