Biology usually has an adaptive mechanism for temperature change, but too high or too low a temperature will have harmful effects on the organisms themselves. In terms of plants, high temperatures will cause the photosynthesis and respiration of plants to be out of order, disrupting the water balance of the plants and causing the accumulation of hazardous substances in the body; for animals, high temperatures will disrupt the activity of proteins, resulting in anoxia, nerve paralysis and so on.

Different organisms for high temperature tolerance is different, but a long period of high temperature environment will cause harmful damage to organisms or even death, such as potatoes at 40 degrees Celsius when photosynthesis will stop, more than 50 degrees Celsius will soon die;

Mammals tolerance limit is generally 42 degrees Celsius, birds are slightly higher than about 48 degrees Celsius, and most of the insects do not exceed 45 degrees Celsius. More than 45 degrees Celsius, the common housefly into the 46 degrees Celsius environment, will soon die;

Of course there are some microorganisms with a strong high-temperature tolerance, such as some thermophilic bacteria can be in the boiling water to survive, but this kind of environment is only distributed in the volcano, hot springs, etc., and can not reflect a wide range of global temperatures, so is not in the list of the discussion.

Global warming

Humanity is currently facing the problem of global warming, according to the Chinese Academy of Sciences on January 15, 2019:

"After 2013, several international teams, including the team from the Institute of Atmospheric Sciences, used a new methodology to make more accurate calculations, concluding that between 1971 and 2010 the rate of warming in the upper 2,000 meters of the global ocean was 0.36 to 0.39 watts per square meter between 1971 and 2010, and that the rate of warming accelerated significantly after the 1990s."

The Earth's average temperature rose by about 0.48 degrees Celsius during the 100 years before 1990, and if it continues unchecked, the global average temperature will rise by 1.4 to 5.8 degrees Celsius by 2100, which will have a serious impact on the Earth's environment.

Global warming is causing glaciers to melt and sea levels to rise, seriously threatening the ecological balance and jeopardizing the survival of humans themselves.

Unlike high temperatures, it is thought that organisms are better adapted in terms of low temperatures, which usually cause them to reduce their metabolic rate.

In the case of animals, hibernation and warmth can be used to adapt to the cold, and animals have their own heat-producing mechanisms, so if there is enough food, low temperatures are not terrible;

In the case of plants, low temperatures can cause plants to stop growing and scatter leaves, and due to the protection of the cell wall, the ice crystals are not prone to produce serious harm to plant cells.

Many of the effects of cold temperatures on living things are reversible, and as technology advances, cold temperatures are playing an increasing role in medicine, and some germ cells and even organs rely on cold temperatures for storage.

I don't think it's ever good for the planet to go either up or down, as it would cause great ecological disaster!

If the extreme cold, everything for the low heat growth support, so that the plant leaf rod light and oxygen release is too little for people to exhale carbon dioxide and the body of the eyes and ears of the people sweating in the mouth of the transportation of the virtual yin sinking does not correspond to the plant's large number of photosynthesis to receive the conversion,, naturally, will make the soil hard, the soil gas exhalation force is weak and moisturizing force is poor, is more sick and lose strong physical strength.