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Human activities have had tremendous impact on modern forests. Since agriculture began about 11,000 years ago, large areas of forest have been cleared for farms and cities. During the 1800s and 100s, great expanses of forests have been eliminated because of logging activities and industrial pollution. The destruction of forests is called deforestation.
History
Most people think that deforestation is a recent occurrence, gaining momentum in the tropical regions of the world since about 150. But it started a long time ago when humans first occupied the earth and began to use fire deliberately around half a million years ago. All that has changed since the mid-twentieth century is that an ancient process has accelerated, and that, compared to previous ages, environments more sensitive and irreversibly damaged have been affected. Possibly as much as nine-tenths of all deforestation occurred before 150. Chopping down trees is part of an age-old human quest for shelter, food and warmth. Trees provide wood for construction, shelter and making a multitude of implements. Wood provides the fuel to keep warm, to cook food and make it palatable, and even to smelt metals. The nuts and fruits of the trees are useful for human foods, medicines, and dyes, and the roots, nuts, young shoots andanches provide food for animals. Cleared forest provides (at least initially) naturally nutrient-rich soils for growing crops. Clearing requires no sophisticated technology. Humans with stone or flint axes only needed boundless energy to fell trees but its not only humans which cause damage to forests, fire andowsing animals can wreak havoc with little effort. The change form stone to metal axes c., 500 years ago, and then for saws in the medieval period, eased the back-eaking task of clearing, and accelerated the rate of change, but it did not alter the basic process of destruction. Power-saws during the last fifty years have made a major impact. Deforestation and Biodiversity
Worldwide, 5 to 80 million species of plants and animals comprise the biodiversity of planet Earth. Tropical rain forests-covering only 7% of the total dry surface of the Earth-hold over half of all these species. Of the tens of millions of species believed to be on Earth, scientists have only given names to about 1.5 million of them, and even fewer of the species have been studied in depth. Many of the rain forest plants and animals can only be found in small areas, because they require a special habitat in which to live. This makes them very vulnerable to deforestation. If their habitat is destroyed, they may become extinct. Every day, species are disappearing from the tropical rain forests as they are cleared. We do not know the exact rate of extinction, but estimates indicate that up to 17 species disappear worldwide each day.
The loss of species will have a great impact on the planet. We are losing species that might show us how to prevent cancer or help us find a cure for aids. Other organisms are losing species they depend upon, so they also face extinction themselves.
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