 He has covered the Space Shuttle Columbia disaster, the 2000 presidential election and September 11 attacks as well as other major U.S. events.Yamaguchi has also covered international events including the wars in Afghanistan and Iraq, indigenous cultures in the Amazon, Argentina's economic collapse, the Inuit whale hunt, Japanese suicide, Korean defectors, Global Warming, AIDS in Cuba, free press in the Middle East, and the HIV/AIDS epidemic in India.While producing a series of reports on global warming and other environmental issues, Yamaguchi traveled to Colombia and Bolivia to produce a series on coca cultivation and changing attitudes toward U.S. policy in the region.