A、They pose great threat to people’s health. B、They are bad for economic development C、They insert negative effects on the envir

It is the end of the road for these broken, outdated and unwanted electronics. Seoul city throws out some 10 tons of e-waste each year, and about a fifth of that arrives at this recycling center. But it is not just about earning profits, says the center’s CEO Ji. It is about protecting the environment.
   "Our planet has a limited amount of natural resources," he said. "Our company contributes to a sustainable society, by preserving these materials." Ji says about 90 percent of what is brought here gets recycled. Accumulating large piles of electronic trash is not only a concern in technologically-advanced South Korea.
   The United Nations reports millions of tons of the world’s e-waste winds up in developing countries. There, poisonous materials like lead and mercury pose a severe health risk. That is despite international agreements that ban the export of discarded electronics.
1. What is the purpose of recycling e-waste in Seoul’s recycling center?
2. Why do international agreements ban the export of discarded electronics?