Look in the text and correct the information in these sentences.
1. Over the next 50 years about 25% of land animals will become extinct.
2. More than 1 million species will be lost by 2050.
3. This loss represents more than 10% of all plants and animals.
4. The research took two years to complete.
5. More than one third of 300 South African plant species studied were expected to die out.
6. The Cerrado region of Brazil covers one fifth of the country.
7. 1 870 species of tree were studied in Mexico.
8. The greenhouse effect takes 25 years to have its full effect.
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