Volcanic eruptions <ul><li>The presence of aerosols (volcanic ash, dust, and sulfur- based aerosols) in the air increases the amount of solar radiation that is reflected back into space. Earth lower atmosphere to cool. </li></ul>
Ocean circulation <ul><li>The changes in ocean circulation also can result in short-terms climates fluctuations. </li></ul>
Solar activity <ul><li>When the sun is most active, it contains dark blemishes called sunspots. </li></ul>
Earth Motions <ul><li>These geographic changes in earth’s land and water bodies cause change in climate. </li></ul><ul><li>Changes in the shape of earth’s orbit and the tilt of earth on its axis are other earth motions that affect global climates. </li></ul>
Human impact on climate changes <ul><li>Human activities have contributed and will contribute to global climates change. Also natural processes have certainly contributed to many climates changes throughout earths 4.6-billion year history. </li></ul>
The Greenhouse Effect <ul><li>The greenhouse effect is a natural warming of both earth’s lower atmosphere and earth’s surface. </li></ul>
Global Warming <ul><li>As A result of increases in carbon dioxide levels, as well as other green house gases, Global temperatures have increased. This increase is called Global Warming. </li></ul>
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