In winter it is the heat which is better preserved

Five months after being accused by several Western countries have prevented the signing of an ambitious agreement in Copenhagen, China, three years the largest emitter of greenhouse gases, will seek over the universal exposition in Shanghai to prove that she actually commenced his transfer towards greener growth. The country has chosen to focus the event on the theme "Better city." "A better life", which should enable it to put on stage, to its foreign partners but also to its population, its ability to invent the world of tomorrow.

On the site, the organizers have installed elegant rain collectors to feed a portion of the water of the place. In disseminating solar panels on the roofs of several buildings, the organizers say able to generate up to 5 megawatts of electricity - it would therefore be the largest solar project in the country - which will reduce coal consumption.

Attempting to be associated with the green of Chinese growth, many foreign groups will take advantage of the event to promote their own revolutionary technology. "China represents for us an extremely important development base," confirms Valérie Tardy, Director of marketing and development of the French group Xella. Already world leader of cellular concrete, society team eight pavilions with its concrete Ytong, with bubbles of air that it encloses, allowing intelligent management of the variations in temperature. "Usually, buildings need a bearing wall and internal or external insulation." "Our concrete fills him all these functions", details the head. In the summer, the pieces can been rehearsed more easily. In winter, it is the heat which is better preserved. "In China, these construction techniques are still little-known but the exhibition will be an opportunity to show that it is possible to" point Valérie Tardy before that his group has just open his 5ecentre of production in the country.

Vehicles of the future

In a megalopolis of 20 million people known for its hellish traffic jams, the General Motors group, working in the country with the automaker SAIC Shanghai, will submit tomorrow, the public vehicle of the future. The US group puts especially forward his strange in-V - pronounced "envy"-, a narrow two-seat resembling a ski gondola vehicle. Powered by an all electric motor, it can be activated in an autonomous driving mode that allows passengers to be guided in the circulation by a very developed GPS system, organizing the avoidance potential plugs, and a multitude of censors that prevent any collision. In another more futuristic model, called the "leaf", Chinese SAIC has worked on a vehicle using a motor powered by a solar panel installed on its roof and small wind turbines in its wheels. Equipped with a system reproducing photosynthesis, the hull of "leaf" could absorb CO2 but also of rainwater before spit out oxygen. "We hope that it will be possible together and set the man, the car and the nature as early as 2030," explained Liu Qihua, the head of the technical centre of the Chinese manufacturer that hopes to not only see soon an emission 0 vehicle but a negative emission car, fighting itself against global warming.