and it may be hardo imagine, but local nature reserve useto be the city dump. for 15 years, people pil their waste on to two towering mountains. they've since be covered over anbeautified for people to enjoy. translator: i've seen a big difference. not only has thenvironment improved b our culture is healthier. >> reporter: the governme's pledgef makingts cits eener and in som case more colorful has receid the praise of t united nations. $87 billion u.s.ill be spent over the next five yrs to reduce greenuse gas emissions. it's one of the most aitious environmental plans anywhe in the world. the plan doehave its critics. >>e think these ki of mention is all lia. they are n true green. they are fake ones. >> reporter: take the case o sihwa. environmentasts say while using tidal power is a good idea rinciple the plant could end up floodin neighring mud flats, destroying the habitat of migratory birds. the government admits ere are shortcomings b says the overalbenefits of providing cleaner air caonly be better for everne, including the wildlife. steve chao, al jee