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Global warming could make humans shorter.Scientists claim to have found evidence that it caused the world's first horses 1． (become) smaller nearly 50 million years ago.In fact，a team from the universities of Florida and Nebraska says, 2． has found a link between the earth heating up and the size of horses，during the last time the world heated up.The scientists used fossils to follow the evolution of horses from their earliest 3． (appear)56 million years ago.As temperatures went up，their size went 4．. The scientists say that the current warming could have the same effect 5． mammals and could even make humans 6．(small)．“Horses started out small，about the size of a small dog.What's 7．(surprise) is that after they first appeared，they then became even smaller and then dramatically increased in size，and that 8． (exact)corresponds to(符合)the global warming event，followed by cooling.”“It had been known that mammals 9． (be) small during the last warm time，10． we hadn't realised that temperature specifically was driving the evolution of body size，”Dr Bloch said in the Science journal.