Green Building Initiative
Cities are increasingly requiring developers to construct more energy-efficient buildings as a way to curb greenhouse gas emissions.
Assessing progress is difficult for 728 cities in a Kyoto-like pact.
A proposed ordinance would require large building projects to be environmentally friendly.
L.A. panel approves rules to slash energy use up to 15% in large new developments. The plan seeks to cut greenhouse gas emissions in the city.