English subtitles for clip: File:Klimafaktor Sonne (ZDF, Terra X) 720p HD 50FPS.webm

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The causes of natural climate changes
are often of cosmic nature.

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The earth moves
in an elliptical orbit around the sun,

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so that depending on the distance,

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cyclical changes
in the earth's climate occur.

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Warmer and colder periods

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have changed periodically
in the last few million years.

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Also the activity of the sun can
change over longer periods of time.

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In addition, the inclination
of the earth's axis

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causes the sun to shine differently
on the tumbling planet.

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But does this have anything to do
with current climate change?

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If we would look at the sun,
then the solar radiation on the earth

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has become weakened in recent years.

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In other words, if the sun truly were
responsible for today's climate change,

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we would assume
that it should have been colder.

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But that is not what we are observing:
Right now it's getting warmer.

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This means sun cannot be the main
driving force for current climate change.