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What Causes Climate and Climate Change

What causes climate and climate change?

What causes climate and climate change?

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    • Weather and Climate
      Weather is the state of the atmosphere in a region over days and weeks, while climate is the average state of the weather over the longer term – decades, centuries, and millennia. Both are described by temperature, air pressure, cloudiness, moisture, wind speed, and wind direction. Many factors influence climate: the amount of sunlight, the condition of the atmosphere, the oceans, the solid Earth, the great ice sheets, and life itself. It is the complex interaction of all these influences that regulates climate and causes climate change.

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In This Section

Climate Cycles

Climate cycles

The seasons, which are caused by the tilt of the Earth’s axis, are the most important periodic fluctuations in climate.

The Atmosphere

The atmosphere

The atmosphere is an envelope of gases that surrounds the Earth and is held there by gravity.

How Climate is Recorded in Ice

How climate has changed

Climate changes over time. Twenty thousand years ago, much of Europe and North America was covered with a thick sheet of ice, as Greenland is today.

Lobate Coral

Lobate coral

Coral is a useful indicator of local past climate.

Atmospheres on Earth and Venus

Atmospheres on Earth and Venus

Venus and Earth are about the same size and probably started out with similar atmospheres, but now their atmospheres — and climates — are very different.

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