The cause of global warming

Global warming is due to the greenhouse effect.

Global warming is a phenomenon related to nature. The result of the greenhouse effect is that the energy absorbed and discharged by the earth's atmospheric system is unbalanced, and energy accumulates in the earth's atmospheric system, leading to rising temperature and global warming.

Because people burn fossil fuels, these greenhouse gases are highly transparent to the visible light emitted by the sun, highly absorb the long-wave radiation emitted by the earth, and strongly absorb the infrared rays from the ground radiation, which leads to the rise of the earth's temperature.

Global warming is a natural phenomenon. Because people burn fossil fuels, such as oil and coal. Or cutting down and burning forests will produce a lot of greenhouse gases such as carbon dioxide. These greenhouse gases are highly transparent to visible light from the sun, highly absorb long-wave radiation from the earth, and strongly absorb infrared radiation from the ground, leading to the rise of the earth's temperature, that is, the greenhouse effect. When the greenhouse effect is accumulating, the energy absorbed and discharged by the earth's atmospheric system will be unbalanced, and energy will accumulate in the earth's atmospheric system, leading to rising temperature and global warming. Global warming will redistribute global precipitation, melt glaciers and frozen soil and raise sea level, which will not only endanger the balance of natural ecosystems, but also threaten human survival.

greenhouse gas

Not every gas in the atmosphere can strongly absorb the long-wave radiation on the ground. Greenhouse gases in the earth's atmosphere are called greenhouse gases, which mainly include carbon dioxide (CO2), methane, ozone, nitrous oxide, freon and water vapor. They absorb almost all the long-wave radiation emitted by the ground, and only a narrow section absorbs little, so they are called "window areas".

It is mainly through this window area that the earth returns 70% of the heat obtained from the sun to space in the form of long-wave radiation, thus keeping the ground temperature constant. The greenhouse effect is mainly that human activities have increased the quantity and types of greenhouse gases, decreased the value by 70%, and left residual heat to warm the earth.

However, greenhouse gases such as carbon dioxide have a strong ability to absorb long-wave radiation on the ground, but their content in the atmosphere is very small. If the atmospheric state with a pressure of one atmosphere and a temperature of 0℃ is called the standard state, then the whole atmosphere of the earth is compressed to this standard state with a thickness of 8000 meters.