The indisputable heft China carries these days as \r\nthe world's second largest economy means that its every move is closely \r\nwatched by world markets for clues on future growth and by global \r\ninvestors hungry for the next big thing.

And here is one of those big things, a national strategy and a vision for China's future: the Yangtze River Economic Belt.

How big is this new regional economy? And how will it change China's \r\nnational landscape, both economically and environmentally? Mary helps us\r\n take a look.