1. External causes or astronomical.
are reasons beyond the internal climate system of Earth.
- solar activity changes . Affect the very source of energy and its consequences reach Earth.
- Changes in Earth orbit. Obiter described by Earth gradually changes from an almost circular to a more elliptical. This process takes about 100,000 years and adjust the radiation that reaches Earth.
- meteorite impact. A meteorite is sprayed to collide with Earth and creates a dust cloud that lingers long in suspension.
2. internal causes.
Determine what to do with that radiation.
- Changes in albedo. The average value of the Earth is 30% but varies greatly from one area to another. Consequently, changing the surface coverage is amended global temperature.
- Changes in atmospheric composition. The atmospheric composition can be changed by the intervention of agencies, which will increase or decrease the amount of CO2 and O2, or a major volcanic activity can introduce much CO2 in the air, but also as a result of burning fuels and other human activities increasing CO2 and O2 decrease.
- Changes in ocean currents. In areas close to Ecuador more solar radiation reaches the latitudes near the poles, leading to large temperature differences. Ocean currents, winds also, help reduce these differences.
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