First of all, main cause of global warming is due to an increase in greenhouse gases (carbon dioxide, chlorofluorocarbons, and other pollutants exist), those gases cannot get out of the atmosphere where they are concentrated on them, causing the sun to shine on the Earth, the heat trapped causing the temperature of the Earth to rise. In addition, those gases derived from a variety of reasons such as natural and human.
Activities of natural are one of the factors contributing to global warming. In fact, kind of natural phenomenon releases a huge amount of greenhouse gases into the atmosphere. For example, disasters such as forest blazes, volcanoes emit carbon-filled smoke, the plume of ash and smoke goes out into the atmosphere. In addition, water vapor is present in the atmosphere and has a strong effect on weather and climate, since water vapor is a type of greenhouse gas, so more water vapor in the atmosphere leads to more global warming. Moreover, the grayish-black grime that coats urban buildings traps and holds nitrous oxide, it also releases it concentrated amounts when the sun warms the grime (Sonia Madaan, 2016). It can be seen that global warming is a natural phenomenon of the Earth.
On the other hand, if natural causes to create global warming, people’s activities have accelerated the process of global warming. Especially, Activities such as burning fossil fuel, farming, deforestation generates huge amounts of greenhouse gases. For example, Australia has the level of CO2 pollution per person is nearly double the average of other developed nations and more than four times the world average by 73% of their electricity comes from coal burning and 13% from burning gas. Besides, this country’s agriculture with livestock are grazed at a large scale contributes 16% of our total greenhouse gas emissions. In addition, Plants play an important role in regulating the climate, but up to one-fifth of global greenhouse gas emissions comes from deforestation and forest degradation. (Causes of global warming, 2017). According to research results, “In the period 1994-2010, total greenhouse gas emissions in Vietnam (including LULUCF) increased rapidly from 103.8 million tons of CO2, equivalent to 246.8 million tons of CO2. Equivalent, in which the energy sector grew the fastest from 25.6 million tones of CO2 equivalent to 141.1 million tons of CO2 equivalent and also the largest emitter in 2010.” (UNDP – Human Development Report, and Vietnam’s first announcement of the United Nations Framework Convention on Climate Change, 2007/2008). Consequently, global warming is mainly caused by human impacts on the environment and nature.