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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 plannet and Tropical plants thrived in high latitudes. It is different from what is was even 18,000 years ago.when ice sheets covered mush more of the northern hemispher. In the future it will surely to continue to involve. In part the evulsion will be driven by natural causes, such as slow changes in the earth orbits over many thousands of the year.