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When tractors were first developed, they used enormous steam engines that were notoriously unreliable and hard to maintain. These were phased out around the turn with the twentieth century and substituted for internal combustion engines which were smaller though powerful and ran on a number of fuels including kerosene, ethanol and gasoline. By the 1960s several of these engines were phased out and only more effective internal combustion engines that ran on diesel and after this, biodiesel. Efforts are created to protect once abundant asiatic elephants.Elephants are threatened by poaching for tusks,from the decrease of habitat due to human pressure on forested areas and due to human conflict.The isolated populations of wild elephants in individual wildlife sanctuaries can also be threatened by decrease of genetic diversity.Recently several corridors connecting wildlife sanctuaries have been in existence to encourage the migration of wild elephants.