The number of Sunspots appear on average five years from 1610 to 2000. 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 temperature (source: NASA). The change of the intensity of the Sun also causes the change of energy radiated to the ground changes alter the Earth's surface temperature. In particular, since the Sun formed 4.5 billion years close to the present intensity of the Sun has increased by more than 30%. So can see the fairly long period of time so that the change in the intensity of the Sun is not a significant influence on CLIMATE CHANGE. Volcanic eruption-When a volcano eruption will emit into the atmosphere an amount of extremely large volume of sulfur dioxide (SO2), steam, dust and ash into the atmosphere. Large volumes of gas and ash can affect the climate in many years. Small particles called the sol gas is belched by the volcano, the aerosol reflected radiation (energy) the Sun back into space so they can take effect reduces the temperature of the surface layer of the Earth. Today's Ocean-The Ocean is a major component of the climate system. Ocean currents move large amounts of heat around the planet. Changes in ocean circulation can influence the climate through the movement of CO2 into the atmosphere.
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