Praveen Duddu: Hydropower is one of the oldest and most widely-used renewable sources of energy. China, the world's largest producer of hydroelectricity, operates two of the 10 biggest hydroelectric power plants in the world, including the world's largest Three Gorges project.
Robert Schenter, physicist: He specialized in the production of radioisotopes in reactors for nuclear medicine. Much of nuclear medicine depends on a steady supply of an isotope called molybdenum-99—“Mo-99” for short. A by-product of nuclear fission, Mo-99 decays to produce another radioactive substance, technetium-99m, which is employed in more than 16 million nuclear imaging procedures every year in the United States alone, including sentinel node biopsies in cancer surgery, bone scans, and cardiac stress tests.
Wolfgang Buescher: Extreme Green Activists demand that mankind protection "nature" above everything else. The same people demand the installation of tens of thousands of wind turbines in each country. Wind turbines destroy nature, the environment, and kill birds and bats that they insist everyone protect. Besides this ludicrousness, powering modern electrical grids with such variable electric power is the opposite of what most technical people insist on."
Skip Hobbs, geologist: The Future of Planet Earth: A Changing Biosphere, Humans, and Global Stewardship. Since its creation 4.5 billion years ago, the earth has experienced constant change. Geologic change takes time. Human civilization has made, and continues to make, profound changes to the earth, both to the benefit and detriment of mankind and all other inhabitants of earth's biosphere.