. >> hanover messe is under way with 65 exhibitors from 700 countries. >> the dominant country this year is china. he wants trade with germany to increase by 50%. especially green tech. >> green technology is the buzzword in hanover this year. this exhibit shows a new cooling system. in immerses -- it immerses with solutions. this also save some material. thanks to ground-breaking design and construction, it weighs much less than other generators of similar size. >> it is 60 tons lighter. that means renewable energy will get a boost and become more competitive. >> one company has licensed its technology to a chinese company that has become the country's biggest producer. is also developing its own system. another case where china is learning from its european partners. >> to china where the real estate market is in trouble. and growth is the lowest in decades. bair in an expansion of course -- they remain in expansion of course. >> the maker of electrical switch boards and electrical systems -- it has to find new ways to meet its goals of expanding in the international market. >> the chi