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Chemists have been converting CO2 into fuel - via a process called electrochemical reduction – since the 19th century, but as yet no method has proven sufficiently energy-efficient to reach commercialization.

Cataloging the wares could be one of the trickiest parts of the job. Space-recycling ventures would have to keep records of all of the hardware they have on hand, and there’d have to be “barcodes for everything,” Volkert said.

Cashdollar argued that circulation is a poor indicator of a book's value, since books are often consulted but not checked out. Substantially thinning a library's print collection also ignores the role of serendipity in research - looking for one book in the stacks and stumbling upon another, leading to some new insight or approach, critics say.

Cargo is loaded onto a flight of SF Express Co Ltd in Shenzhen, Guangdong province. [Photo by Chen Wen/China News Service]

Changan Automobile reported sales of 169,415 units in August, increasing 35.6 percent compared with last August. Seeing year-on-year growth for five consecutive months, the carmaker achieved sales of more than 1 million for the year to date. Great Wall Motors sold 89,442 cars last month with an increase of 27 percent year-on-year.