In 1950, the world health organization spray DDT around the Southeast Asia island because of the malaria, so they spray the DDT to kill the mosquitoes, but there is side effect of DDT like other chemicals DDT not also kill mosquitoes, but it also kill thatch-eating insect. When the DDT go inside the insect it is the food of the gecko and the rat eat the gecko and the cat eat the rat, so the cat die because of the DDT, this make the population of rat and other animal increase, so people send cats with parachute to help them
System Thinking mean to think of whole, it is to look around your self in the many view.
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