The Tallest Buildings in the World

The Sears Tower will be getting a ‘green’ upgrade that includes wind turbines, roof gardens and solar panels will join the pair of antennas atop the Sears Tower’s staggered rooftops, said building officials who announced Wednesday that the skyscraper would undergo a $350 million green renovation.
The 5-year project would reduce the tower’s electricity use by [...]

The city’s planning board has endorsed a proposal for a twisting lakefront tower that would become the nation’s tallest building.
With Thursday’s approval from the Chicago Plan Commission, the design and site plan for the 2,000-foot Chicago Spire goes to the city zoning committee next week.
“This is a wonderful project, and everyone is very enthused,” said [...]