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Significant investments in research and improved standards in engineering and zoning for these sectors could help minimize the conflict between conserving biodiversity , and much-needed efforts to alleviate poverty and to accommodate the population growth that occurs during the next several decades . For the past several decades , computer systems have used two digits to represent the year , such as " 97 " for 1997 , in order to conserve electronic data storage and reduce operating costs . Leo Estrada in his evening presentation graphically described the nature of immigration trends anticipated in the United States over the next several decades . That split is captured in his reflections on the Darwinian decade that had begun thirty years before . Though the Reys wrote other children 's ' books , and though the couple has since died , it 's George who is in his seventh decade and still causing trouble . In other words , it would take several decades for such a link to become manifest . " In the early decades , smoking prevalence was more prominent among men , and it took nearly 25 years before the gap narrowed and smoking became commonplace among women , " said the Surgeon General . Based on a short story by Annie Proulx that ran in The New Yorker , " Brokeback Mountain " is the story of two men who fall in love and spend the next several decades trying to be together as much as possible , that is , in a culture where a gay man and a tire iron were considered a natural match . Obesity is less common after the age of 70 among both men and women , possibly due to a progressive decrease in BMI with increasing age past the fifth decade or to an excess in mortality associated with increasing BMI in the presence of increasing age ( 1 ) .