San Francisco Chronicle: Plans to build San Francisco’s first biodiesel plant have been tripped up by environmentalists who argue that the city failed to consider hazards associated with converting fat into fuel. Darling International Inc. has operated since the 1960s at Pier 92, south of Islais Creek. Darling creates tallow by processing bones and other animal parts from meatpacking facilities and restaurants. The company now sells the rendered tallow for the production of soap and fertilizer, but wants to …