新理念綜合教程book4單元測試(已修改)
2025-08-17 08:06 本頁面
【正文】 The soaring number of genderbending chemicals in the environment has disturbing fertility implications for humans and wildlife, scientists are warning. They say wild animals are being feminised by a host of mon manmade pollutants which mimic the female sex hormone oestrogen and escape into seas, rivers, the earth and air when waste is disposed of. The chemicalsfound in food packaging, cleaning products, plastics, sewage and paintcause genital deformities, reduce sperm count and even turn males into females. Dozens of speciesincluding polar bears, fish, whales and ottersare suffering, according to the environmental group ChemTrust. Fish have been badly hit by manmade genderbending chemicals. In one study, half the male fish in British lowland rivers had signs of being feminised. But all vertebratesor creatures with backboneshave similar sex hormone receptors in their bodies. Therefore, observations in one species may serve to highlight pollution issues of concern for other vertebrates, including humans, the report says.
Its author, Gywnne Lyons, a former government adviser on chemicalpollution, said: some Urgent action is needed to control genderbending chemicals and more resources are needed for monitoring wildlife. If wildlife populations crash, it will be too late. Unless enough males contribute to the next generation there is a real threat to animal populations in the long term. Some studies have shown that sperm counts in the West have fallen over the past 30 years. Others have shown a rise in boys born with genital deformities. Communities heavily polluted with hormonedisrupting chemicals in Russia, Canada and Italy have produced twice as many girls as boys.Passage TwoBiological diversity has bee widely recognized as a critical conservation issue only since the past two decades. The rapid destruction of the tropical rain forests which are the ecosystems with the highest known species diversity on Earth has awakened people to the importance and fragility of biological diversity. The high rate of species extinctions in these environments is jolting,
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