What does the global climate change discussed by the international community mainly mean?

The global climate change discussed by the international community in the past mainly refers to global warming and its possible impact. The core of this problem is the greenhouse gas emission caused by human activities, especially the increase of carbon dioxide, which leads to the change of the earth's climate system. Global climate change includes: rising temperature, extreme weather events, rising sea level and loss of biodiversity.

1, temperature rise: the average temperature of the earth's surface rises year by year, leading to climate warming. According to scientific research, most of the temperature rise in the past century is due to human emissions of greenhouse gases.

2. Extreme weather events: Global climate change has increased the frequency and intensity of extreme weather events, such as heat waves, droughts, rainstorms and hurricanes. These extreme weather events have had a serious impact on human beings and ecosystems.

3. Sea level rise: Global climate change leads to melting glaciers and ocean expansion, which in turn leads to sea level rise. This may lead to the inundation of coastal areas and the destruction of coastal ecosystems.

4. Loss of biodiversity: Climate change has a negative impact on biodiversity. Environmental changes caused by climate change may lead to species extinction, habitat loss and ecosystem collapse.

Global climate change has aroused widespread concern and discussion in the international community. Through international frameworks and agreements such as the United Nations Framework Convention on Climate Change and the Paris Agreement, the international community is committed to reducing greenhouse gas emissions, adapting to climate change and improving global disaster reduction capabilities.

Causes of global climate change

First, natural factors.

1, solar activity: the change of solar activity will have an impact on the earth's climate. The irregularity of sunspot activity cycle may lead to the change of solar radiation received by the earth.

2. Volcanic eruption: Volcanic eruption will release a lot of gas, dust and particulate matter, which can block solar radiation and cause the temperature of the earth's surface to drop.

3. Changes in natural systems: Changes in natural systems such as ocean circulation, monsoon, glaciers and forests will have an impact on the global climate.

Second, human factors.

1. Greenhouse gas emissions: Human activities are mainly in industries such as industry, transportation, energy production and agriculture, which emit a lot of greenhouse gases, especially carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). These gases accumulate in the atmosphere, forming a greenhouse effect, leading to an increase in the temperature of the earth.

2. Destruction of forests and ecosystems: Large-scale deforestation, land reclamation and destruction of ecosystems have led to the release of a large amount of carbon dioxide. Forest is an important factor to absorb carbon dioxide and release oxygen; When forests are destroyed, the absorption capacity of carbon dioxide is reduced, which further leads to global climate change.

3. Efficient mobile use of fossil fuels: A large number of fossil fuels (such as coal, oil and natural gas) are used to meet energy demand, and at the same time a large number of greenhouse gases are released.

Greenhouse gases emitted by human activities are the main reason for the intensification of global climate change. Reducing greenhouse gas emissions and adopting adaptive measures are the key to deal with global climate change. This requires global cooperation and effective emission reduction measures, including promoting renewable energy, improving energy efficiency, protecting ecosystems and sustainable agriculture.