We often hear Carbon dioxide, but do not know much about it, and now,let's learn more about it.

Carbon dioxide is a common compound in the air, whose molecular formula is CO 2 ，There is a trace of carbon dioxide in the air, about 0.03% of the total volume of air, equivalent to 387ppm of the volume of the atmosphere. Carbon dioxide can dissolve in water to form carbonic acid. Carbon dioxide is not toxic, but when the level of carbon dioxide in the air exceeds normal levels, it can have harmful effects on the human body.

The damage of carbon dioxide:

1 、The temperature on the earth is getting higher and higher, mainly due to the increase in carbon dioxide. The carbon dioxide has the effect of heat, as carbon dioxide increases, the temperature will increase accordingly. In the past 100 years, the global temperature Has increased by 0.6 ℃ ， If this temperature continues to rise, it is expected that global temperatures will rise by 1.5- 4.5 ℃ by the middle of the 21st century .

2 、Sea level rise is also caused by the increase of carbon dioxide. In the past 100 years, sea level rose by 14 centimeters. By the middle of twenty-first Century, sea level will rise by 25-140 centimeters. As the sea level rises, the Amazon rainforest will disappear, and the ice in the polar oceans will also melt a lot. All these changes are undoubtedly a disaster for Earth.

3 、The content of carbon dioxide in the atmosphere is generally about 0.03% ，but the effects of human activities (such as fuel combustion) have led to a rapid increase in carbon dioxide content in recent years, the greenhouse effect, global warming, melting of glaciers, and sea level rise …… 3.The Kyoto Protocol, which aims to curb excessive carbon dioxide emissions, has entered into force and is expected to curb greenhouse effect through international cooperation.

4 、The effect of carbon dioxide on agriculture has proved that plants will grow faster and taller under the condition of high concentration of carbon dioxide. However, the result of global warming will also affect the atmospheric circulation, and then change the global rainfall distribution and the water content of the surface soil of continents.

Toxicity：

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