Discuss the natural causes of climate change. 

The natural variability and the climate fluctuations of the climate system have always been part of the Earth’s history. To understand climate change fully, the causes of climate change must be first identified. The earth’s climate is influenced and changed through natural causes like volcanic eruptions, ocean currents, the Earth’s orbital changes, solar variations and

internal variability.

Volcanic eruptions - The main effect volcanoes have on the climate is short-term cooling. Volcanic eruptions pump out clouds of dust andash, which block out some sunlight. Because the ash particles are relatively heavy, they fall to the ground within about three months, so their cooling effect is very short-lived. But volcanic debris also includes sulfur dioxide. This gas combines with water vapour and dust in the atmosphere to form sulfate aerosols, which reflect sunlight away from the Earth’s surface. These aerosols are lighter than ash particles and can remain in the atmosphere for a year or more. Their cooling effect outweighs the warming caused by volcanic greenhouse gases – the eruption of Mount Pinatubo in 1991 caused a 0.5 °C drop in global temperature. Volcanic eruptions spew _________ __________ ________ ____ ___.
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