A timber shortage in France has forced prices up as architects struggle to comply with a new environmental law that requires public buildings to be 50 percent wood.  French architects are reporting wood price rises of up to 50 percent since the start of the year.  "The prices are going up every week," said Christophe Lemoal of Paris studio Lemoal-Lemoal. "We have two construction projects where the wood company can't give us any date for the delivery because they can't find the supply."  Michel Hardoin of Bordeaux architect A6A said shortages ...