Researchers in Britain say in the long term, global warming could lead to a mass extinction of animals and plants. The scientists examined fossil records from more than half a billion years of history. They discovered that each of five major eras of declining diversity corresponded to cycles of severe warming. This service may include material from Agence France-Presse (AFP), APTN, Reuters, AAP, CNN and the BBC World Service which is copyright and cannot be reproduced. read more

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