Are humans the cause?

Before the industrial revolution and the world population after that, the climate of the earth has changed with the power of nature. Such climate change usually changes from the ice age to the interglacial period, and then again over the long term.

Since industrialization, human compulsive climate has become clear. Current trends of global warming can not be explained by just the power of nature. If we want to fully explain the trend we are currently observing, we need to consider the cause of human (global) global warming.

Figure 1 compares the results of changes in surface temperature observed from 1901 to 1950 with climate models using natural forces and human forces.

The blue shadow band shows a range of 5-95% of 19 computer simulations of five climate models, using only solar activity and natural forcing by volcanoes

The red shadow band shows a range of 5-95% of 58 simulations using 14 climate models of nature and human enforcement

Carbon dioxide (and other greenhouse gases) are added to the atmosphere through natural processes and human activities. In the past, carbon dioxide concentration was quite stable due to the balance between release and intake. Today, humans release carbon dioxide into the atmosphere at a faster rate. This increased contribution takes place too soon, the environment (ocean, vegetation) responds and can not absorb excess. As a result, the concentration of carbon dioxide in the atmosphere increases.

The main source of excess carbon dioxide can be traced back to humans. Since the Industrial Revolution, we have relied on fossil fuels to support our lives. We use fossil fuels to bypass the house, heat up, and promote our industry. Carbon dioxide emissions are also increasing as reliance on fossil fuels increases

Man not only releases excessive carbon dioxide into the atmosphere, but also changes the ability of the earth to process this excess. As the population of the world increases, we occupy most of the surface of the earth. We will clean the land to make a way for the city and the human settlement. We will add more food and manipulate our landscape to graze more livestock. By changing the natural landscape, we are changing the environment's ability to cope with the excessive behavior we create.

Q2: Compared with natural processes, humans contribute very little to carbon to the atmosphere. How does it affect so much?

Our planet has a natural circulation that puts 200 billion tons of carbon annually into and out of the atmosphere. When the cycle is balanced, the atmospheric carbon dioxide (CO2) level remains relatively constant. Careful measurements over the past several decades have confirmed that carbon dioxide in the atmosphere is increasing

About 7 billion tons of carbon is annually added to the shield by human activity, accounting for only 3-4% of the annual exchange. This small addition breaks the balance and is enough to transcend the natural ability to absorb carbon. The sea and land currently absorb half of the emissions, but the rest is in the atmosphere for at least another 100 years.

Land contamination is natural or artificial contamination of the land. Either way, the final result is that the land is increasingly polluted. Land contamination may be caused by natural methods or by humans. Causes of nature such as volcanic eruptions, hurricanes, tornadoes and the like may contaminate the land, but since they are natural, we can not do anything about it. However, human beings destroy land directly or indirectly is worse than the cause of nature. Agricultural practices focused on high yield crops and raw materials. These include overfarming, land abuse, chemical fertilizers, pesticides, pesticides and herbicides, introduction of alien species as a means of controlling pests, deforestation, disorganized agricultural waste disposal, and so on.

There are many reasons for global warming, some are natural, others are artificial. The most important cause of global warming is the greenhouse gas produced by natural processes and human activities. Due to the increase in population, economy and energy consumption, the level of greenhouse gases rose in the 20th century. The increase in industrial demand in the modern world almost satisfies various needs and releases various greenhouse gases through many industrial processes in the atmosphere.