There are two main causes of climate change which is caused by natural and human.1. The cause of climate change is natural:The cause of climate change due to natural changes include the intensity of the Sun, appear black spots (Sunspots), volcanic activity, ocean changes, change the orbit of the Earth's rotation. With the appearance of Sunspots make the intensity of radiation the sun shining down on the Earth changes, i.e. the energy radiated down the ground changes alter the Earth's surface temperature2. The cause of climate change caused by human activities:There have been other studies that demonstrate that Earth's surface temperature to rise quickly over the past half century is mainly due to human activities, such as the burning of fossil fuels (coal, oil, etc) serve the industrial activities, transportation , etc. and change the purpose of land use (land surface albedo change) including changes in agriculture and deforestation. There are also a number of other activities such as the burning of biomass, harvest product.
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