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Although scientists have been cataloging species for over two centuries, custom name lets get lit happy a merry christmas nukka ugly sweater only 1.8 million have been identified out of a total 3 to 30 million estimated species worldwide.

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about biodiversity loss may lead to different conclusions about duties to preserve plants, animals, and ecosystems. Some argue that the duty to protect plants custom name lets get lit happy a merry christmas nukka ugly sweater and animals stems from their value for human uses; those who base the value of plants and animals on human use often attempt to quantify that value by measuring their potential market value in the form of food, pharmaceuticals, fibers, and petroleum substitutes. Yet others argue that plants and animals have intrinsic value and should be treated as sacred objects rather than as material for human consumption. If biodiversity has a value that cannot be quantified in market transactions, it should not be treated as a commodity in a cost-benefit analysis.

Scientists estimate species loss rates by making projections from known rates of habitat loss and comparing these with known species losses in similar ecosystems that have lost habitat. Based on these projections, a recent United Nations report projects that between 2 and 25 percent of the world’s tropical forest species will become extinct in the next 25 years. Given known rates of extinction, it is clear that humans are accelerating these rates as their impact on the planet increases. Scientists can account for the extinction worldwide of 75 mammals and over 1,600 birds, resulting in a loss rate of one species every four years up until the end of the nineteenth century. Between 1900 and 1980 another 75 mammals and birds became extinct, and the loss rate accelerated to one species a year. In 1993, the estimates for mammal and bird extinction were between one and three species a year. The actual rates of species extinction are not known, because relatively few species have been identified.