Did you ever wonder what happens to your old laptop or cellphone when you throw it away?

Chances are some of your old electronic junk will end up in China.

According to a recent United Nations report, "China now appears to be the largest e-waste dumping site in the world."

E-waste, or electronic waste, consists of everything from scrapped TVs, refrigerators and air conditioners to that old desktop computer that may be collecting dust in your closet.

A hydroelectric dam bordering Zambia and Zimbabwe threatens the lives of 3.5 million people in the southern African region as it is on the verge of collapsing, local newspaper Zambia Daily Mail reported Tuesday.

The wall of Kariba Dam, one of the world's largest dams measuring 128 meters tall and 579 meters long, has developed weaknesses and may collapse if nothing is done to repair it in the next three years, the report said.

This spring, construction is set to begin on the first projects coordinated through Power Africa, a multibillion-dollar Obama administration initiative that seeks to double access to electricity in sub-Saharan Africa within five years, and in some cases accelerate reforms in the governments of the nations involved. Among the initial projects are wind farms in Kenya and Tanzania, and a solar project in Tanzania.