The secret of the great extinction and long heat of the past
About 52 million years ago, 90% of the living things on Earth died
After that, the temperature on Earth became very high, and it continued for about 5 million years.
For a long time, scientists have been searching for the reasons this happened.
A global group of scientists have collected many fossils in China.
They used these fossils to search for evidence of past climate, and make a map of past plants and trees.
As a result, scientists discovered that when the temperature on the earth became high, the tropical forests vanished.
Forests can absorb and store carbon that raises the temperature of the Earth.
However, if the forests perish, large amounts of carbon is left in the atmosphere.
This is the reason why the temperatures became so high.
Scientists say that if the current temperature of the Earth continues to rise, the tropical forest may disappear.
This means that there is a possibility that the temperature will rise even higher.
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