More are motivated to offer their services in developing nations

Wu Xiangde is super busy these days. As a veteran volunteer from China, the 65-year-old is on a nonprofit program to treat a highly polluted river in Nairobi, Kenya, updating each day's progress on his blogs.

"There are volunteers from many countries on different projects in Kenya," said Wu, from Liaoning province, who has been involved in programs as a volunteer in Africa since 2003. "You don't feel alone and can gain motivation from others. I am filled with happiness."