Japan's market for carbon emission reduction systems and services to help prevent global warming may expand 5.6-fold from fiscal 2007 to 6.93 trillion yen by fiscal 2015, a market research firm said Tuesday. The fast expansion is coming as the government and private sectors accelerate efforts to achieve Japan's greenhouse gas emission reduction target in four years from April this year under the Kyoto Protocol, Fuji Keizai Co said. Demand for heat pump water heaters, carbon fibers and other products to help reduce carbon dioxide emissions is estimated to increase 4.3-fold to 1.61 trillion yen. Demand is also projected to rise 5.1-fold to 2.16 trillion yen for photovoltaic cells, wind power generators and other new-energy systems.