US Agriculture Secretary Tom Vilsack encouraged development and production of biofuels to power commercial aircraft, telling a Paris Air Show audience there has been "extraordinary progress in the last 12 months" in understanding how biofuel blends can power flights. "I think we're nearing a tipping point" in terms of building momentum toward use of biofuel on commercial flights, he said. "I think [biofuel powering airline flights is] not long-term. In the ...

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