Ok, so i would do:
Deer on Komodo island are decreasing because of increased hunting of the deer, komodo dragons hunting them, and decrease in water supplies. This can be a problem because with less deer for the Komodo Dragons to eat, the more the Dragons will eat villagers, goats, and bison. This will cause ecosystem in-balance and economic collapse.
This will effect the villagers the most because now they will have massive man eating lizards that are hungry roaming around, and they will have to find better ways of protecting themselves and their families. The villagers will then either begin to attack and kill the Komodos or they will be forced out of their village. Neither are good because then one way or another a part of the ecosystem will be lost.
This could be solved in three ways: One, the deer population could be protected on the island of Komodo, until the deer population can spring back. Or two, a certain amount of deer could be humanly captured and protected, bred, then released again so that you could have a guaranteed amount of population increase. And three, you could put a restriction on the number of deer hunted in a day, week and month along with a size restriction. All of these we've done in the U.S, but non have been done in Komodo.
Hope this helps, all you have to do is come up with an introduction, hook/Thesis statement, Restate the thesis, and 2 to 3 concluding sentences, Enjoy!!
Comment below if you need more help brother:)