White House Photo by Pete Souza Gary Le Francois, building manager Transwesterns senior vice president, briefs Obama, Clinton on upgrade project. President Obama and former President Bill Clinton have kicked off a $4-billion public-private program to upgrade a wide range of buildings to make them more energy efficient. Design and construction officials praised the initiative but said other measures could deepen its impact.Unveiled on Dec. 2 as Obama and Clinton toured a Washington, D.C., renovation project, the plan follows earlier green-buildings efforts by the White House and private companies. In a nod to Capitol Hill realities, the program has no
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.