Outdone by an tower extending over 800 meters in Dubai, the world's former tallest building, Taipei 101, wants to become the highest green structure by completing a checklist of clean energy standards.Taipei 101 will spend T$60 million ($1.9 million) over the next year to meet 100 criteria for an environmental certificate that it would hold over Dubai, spokesman Michael Liu said.

The office-commercial tower that reigned for five years as the world's highest building at 509 meters (1,670 feet) expects the U.S-based Leadership in Energy and Environmental Design to give it the certificate in 2011.The Taiwan skyscraper, complete with an observation deck popular with tourists, has already met 60 of the checklist items, including double-paned windows to retain cool air.