Environment 5- pesticides

Does it make sense that a chemical pesticide that was banned from our country due to its harmful affects has not stopped us from selling it to other countries? Do poeple know the Earth in the US is the same Earth as the one across the world?... So why does this happen?.. Are people really so concerned about making money that they dont think about what earning that money does to their environment; to their health; to their family?
The chemical DDT and other chemical pesticides were used in the U.S. Eventually, the Environmetal Protection Agency banned the use of these harmful chemicals in the United States. However, the companies who produce these harmful chemicals and pesticides continue to sell them to other countries. Despite our knowledge of their harmful affects on the environment, we continue to produce and sell the chemicals to other countries... an entire third of the chemicals that these companies produce would be illegal if they were actually used in our country! If they were banned here becuase they are harmful... why is it okay for them to be used in other countries?