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The Earth's climate changes. It is vastly different now from what it was 100 million years ago when dinosaurs dominated the planet and tropical plants thrived in high latitudes. It is different from what it was even 18,000 years ago, when ice-sheets covered much more of the northern hemisphere. In the future it will surely continue to evolve. In part the evolution will be driven by natural causes, such as slow changes in the Earth's orbit over many thousands of years. But further climatic change, unlike that of the past, will probably have another important source as well: human activities.

The world was...

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Updated: 2 months ago
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Not only, on the other hand
However, on the other hand
While, above on
Not only, but also
All of above.
were training
has been training
have been training
been training
had been training
Created: 2 years ago | Updated: 3 months ago
Updated: 3 months ago
Created: 2 years ago | Updated: 4 months ago
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neither, but

very, but

either, but

neither, nor

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