The average number of sunspots appeared in 1610 and 2000. With the emergence of sunspots make radiation intensity sunlight strikes the earth changes, means power to the ground projection changes as temperature changes earth's surface (Source: NASA).
the change in light intensity of the sun also causes changes to the ground reference energy changes alter the earth's surface temperature. Specifically, since the Sun formed nearly 4.5 billion years to present the light intensity of the sun has risen over 30%. Thus can be seen a long period of time so it changes the intensity of sunlight is not significantly affect climate change.
Volcanic eruptions - When a volcano eruption emitted into the atmosphere will be one of extremely large volume of sulfur dioxide (SO2), water vapor, dust and ash into the atmosphere. Large amounts of carbon and ash can affect the climate for years. The small particles called aerosols ejected by volcanoes, aerosols reflected radiation (energy), solar back into space so we can work to reduce the surface temperature of the earth .
ocean today - the oceans are a major component of the climate system. Ocean currents move large amounts of heat around the planet. Changes in ocean circulation can affect climate through the movement of CO2 into the atmosphere.
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