The American Society of Civil Engineers has given the country's infrastructure an overall grade of D+ in a report, a slight improvement from the D in the previous report, issued four years ago. The group estimates that the U.S. needs to invest $3.6 trillion by 2020 to upgrade bridges, roads, dams and schools -- $1.6 trillion more than the amount being spent. "A D+ is simply unacceptable for anyone serious about strengthening our nation's economy," President Gregory DiLoreto said. "We're investing in infrastructure; we're just not investing enough."

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