Planet earth. Seven ways to help save the world

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As the world wakes up to the need to protect the environment, ABC News continues to cover the most crucial ecological issues of today-and tomorrow. This unprecedented program, reported from all seven continents on the eve of Earth Day 2007, examines urgent problems unfolding in the natural world and offers some real solutions to them. From Australia's Great Barrier Reef to the Brazilian rain forest to an African game preserve to a massive solar power array in Arizona, these stories will open eyes, ears, and minds. Seven leading science and business experts share insights on water shortages, species extinction, loss of habitat, and runaway energy consumption. An additional report vividly illustrates simple lifestyle changes that can reduce humanity's collective environmental footprint.