some countries however are in the process of switching to 100 percent renewables custer reka europe y. and iceland. they are leading the way towards a future without greenhouse gas emissions thereby reducing pollution and conserving resources with the necessary investment and the right technology the transition to renewable energy is. possible. now we can be a source of the new bill energy a company in germany has come up with a method to not only clean beast water so that it can be the use but also to generate hydrogen hydrogen is a 0 emission fuel and can be used to power up automobiles feasible is this let's wipe out. the big cities generate a lot of waste water. here in berlin much of it gets processed at this sewage treatment plant. it deals with the effluent of more than a 1000000 people a quarter of the city's population. the water passes through a series of filter beds. within a day 98 percent of the impurities are removed. nature deals with the other 2 percent after the water is fed back into the outside world. with popular therefore we release the treated waste water we add