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9 <br />benefits of economic globalization while simultaneously mitigating the negative impacts <br />of cultural globalization. <br />So there are some ways that heritage conservation contributes to sustainable development <br />through environmental responsibility and through economic responsibility. But I saved <br />the third area -cultural and social responsibility -for last, because in the long run it may <br />well be the most important. <br />First, housing. In the United States today we are facing a crisis in housing. All kinds of <br />solutions -most of them very expensive -are being proposed. But the most obvious is <br />barely on the radar screen -quit tearing down older and historic housing. Houses built <br />before 1950 disproportionately are home to people of modest resources -the vast <br />majority without any subsidy or public intervention of any kind. So you take these two <br />facts -there is an affordable housing crisis and older housing is providing affordable <br />housing and one would think, "Well, then, a high priority must be saving that housing <br />stock." Alas, not so. <br />In the last three decades of the 20th century we lost from our national inventory of older <br />and historic homes 6.3 million year-round housing units! Over 80 percent of those units <br />were single-family residences. Now a few of those burned down or were lost to natural <br />disasters. But the vast majority of them were consciously torn down -were thrown away <br />as being valueless. And today millions of American families are paying the cost by <br />paying for housing they cannot afford. Certainly not every one of those houses could or <br />should have been saved. But if even half were retained instead of razed, the picture today <br />would be much different for the millions of Americans inadequately or unaffordably <br />housed. <br />For the last thirty years, every day, seven days a week, 52 weeks a year we have lost 577 <br />older and historic houses. For our most historic houses -those built before 1920 - in just <br />the decade of the 1990s 772,000 housing units were lost from our built national heritage. <br />But when there are policies to conserve older housing stock, we are meeting the social <br />responsibility of sustainable development. <br />But at least as important as the affordability issue is the issue of economic integration. <br />America is a very diverse country -racially, ethnically, educationally, economically. But <br />on the neighborhood level our neighborhoods are not diverse at all. The vast majority of <br />neighborhoods are all white or all black, all rich or all poor. But the exception -virtually <br />everywhere I've looked in America - is in historic districts. There rich and poor, Asian <br />and Hispanic, college educated and high school drop out, live in immediate proximity, <br />are neighbors in the truest sense of the work. That is economic integration and <br />sustainable cities are going to need it. <br />Earlier I mentioned the labor intensity of historic preservation and the jobs it creates as <br />part of the economic component of sustainable development But I want to mention it <br />again in the social context. Those aren't just jobs. They are good, well-paying jobs, <br />