THE NORTH AMERICAN BISON, WHOSE POPULATIONS WERE DECIMATED BY SETTLERS AND MARKET HUNTERS IN THE 1800S,CAME CLOSE TO SHARING THE SAME FATE

1914. - Tổng hợp các dạng bài cho ôn thi THPT Quốc gia môn tiếng Anh
Tiếng Anh Tổng hợp các dạng bài cho ôn thi THPT Quốc gia môn tiếng Anh
1914. The North American bison, whose populations were decimated by settlers and market hunters in the 1800s,came close to sharing the same fate. Bison survive today only because of the efforts of early conservationists.Today, species require such efforts more urgently than ever. An essential task that falls to present-dayconservationists is to determine which species are most, endangered, so that conservation resources' can be appliedwhere action is needed most. Species are categorized by the degree to which their survival in the wild is threatened.World Wildlife Fund offers a sampling of animals and plants that fall mainly within the two most seriouscategories of- threat: critically endangered and endangered. What threatens these species' existence? Some of thetop threats are habitat destruction by unsustainable logging and ever-encroaching human settlement; pollution ofwater, soil, and air by toxic chemicals; unnatural climate changes due to fossil fuel use; unmanaged fishing thatexhausts fish stocks; and illegal hunting to supply the demand for skins, hides, traditional medicines, food, andtourist souvenirs. The list which conservationists presents only a fraction of the species at risk of extinction todayand does not include thousands of species whose status we do not yet know. Hundreds of species without commonnames have been left out, which means that while many mammals are on this list, only a few insects and mollusksare included.Species listed here range from the largest animal on Earth, the blue whale, to the majestic tiger, to the humblethick-shell pond snail. Large or small, beautiful or ugly, all species play a role in the complex circle of life. All ofus depend on the natural resources of our planet. Each time a species is lost, the complexity, natural balance, andbeauty of our world is diminished. And what threatens plants and animals ultimately threatens people as well.