ວິສະວະກອນ ປາກິສຖານ ໃຊ້ເຟືອງ ທີ່ຖິ້ມແລ້ວ ເປັນເຊື້ອໄຟ

A Pakistani engineer has designed a system to help developing countries avoid fuel imports by making ethanol with the millions of tons of straw that are wasted each year. Faith Lapidus reports.