"This programme has some real problems," Pires says. But it should be revisitedbecause of the environmental cost of continuing to use diesel, he adds.
A handful of problems
Brazil's ambitious biodiesel programme has been plagued by unexpected costs and mandatory blending plans - delaying the South American country's efforts to relieve its dependence on oil.
22 January 2009 23:00 GMT
Updated
25 November 2012 8:57 GMT
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