Several high visibility events including the Olympic Games in Italy, Sydney, Utah, and Greece; the World Summit on Sustainable Development in Johannesburg, and the 2004 Democratic and Republican National Conventions have implemented green practices with varied success. A more recent example is that of Live Earth, a series of worldwide concerts held on July 7, 2007, that initiated a three-year campaign to combat climate change. Such efforts aim to conserve resources, protect air and water quality, habitat and human health, and showcase sustainability practices and concerns.