Even though Japanese citizens tend to throw out only half as much trash as U.S. citizens, Tokyo will be out of space for its garbage in 30 years, according to its sanitation department. Because of a general lack of space for trash in the country, Japan burns about 75 percent of its garbage, compared to a 20 percent rate in the U.S., helping Tokyo to earn Greenpeace’s title of dioxin capital of the world. In other Tokyo news, the government is planning to require that owners of new buildings include plant cover on one-fifth of rooftop space to help fight rising temperatures and global warming.