"The two people were William Vogt and Norman Borlaug. Vogt, born in 1902, laid out the basic ideas for the modern environmental movement. In particular, he founded what the Hampshire College demographer Betsy Hartmann has called "apocalyptic environmentalism"--the belief that unless humankind drastically reduces consumption its growing numbers and appetite will overwhelm the planet's ecosystems. In best-selling books and powerful speeches, Vogt argued that affluence is not our greatest achievement but our biggest problem. Our prosperity is temporary, he said, because it is based on taking more from Earth than it can give. If we continue, the unavoidable result will be devastation on a global scale, perhaps including our extinction. Cut back! Cut back! was his mantra. Otherwise everyone will lose! Borlaug, born twelve years later, has become the emblem of what has been termed "techno-optimism" or "cornucopianism"--the view that science and technology, properly applied, can help us produce our way out of our predicament. Exemplifying this idea, Borlaug was the primary figure in the research that in the 1960s created the "Green Revolution," the combination of high-yielding crop varieties and agronomic techniques that raised grain harvests around the world, helping to avert tens of millions of deaths from hunger. To Borlaug, affluence was not the problem but the solution. Only by getting richer, smarter, and more knowledgeable can humankind create the science that will resolve our environmental dilemmas. Innovate! Innovate! was Borlaug's cry. Only in that way can everyone win!"