Quote: China's costly and wasteful use of energy and escalating environmental degradation threaten the sustainability of its economic boom. Japan, one of the greenest, most energy-efficient countries in the industrialized world, is brimming with the know-how that could help China alleviate these problems. China could benefit from Japanese technology in everything from advanced nuclear reactors to clean steel mills to hybrid cars. And Japan has every incentive to sell that technology to generate new business for its otherwise sluggish economy.