CLIMATE CHANGE -MORE
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Throughout Earth’s history, the climate has changed over long periods of time (thousands or millions of years). In the last 650,000 years there have been seven cycles of glacial advance and retreat. These changes have been gradual, and attributed to small changes in the amount of energy the earth received from the sun1.
About seven thousand years ago, the last ice age ended, marking the beginning of the modern climate era and of human civilization1. Earlier in our history, humans hunted and gathered food, roaming over vast areas of the planet. Gradually, we learned to grow our food in one location or other, and started to settle down. With the progress of agriculture, use of advanced tools and assured food supply, our population grew. Soon we started producing cloth, machinery, and living together in villages, towns and cities. The Industrial Revolution got underway and coal (a fossil fuel) was burned to generate energy. Prosperity started to increase.
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