An earlier version was originally published in the Toronto Star. Canada’s aviation sector made history in 2012 after a number of test flights showed that renewable jet fuel could be blended with regular fuel without affecting airplane performance. It started in April, when Porter Airlines used a blend of 50 per cent “biojet” fuel on a Bombardier turboprop, which successfully flew from the Toronto island airport to Ottawa. Two months later, Air Canada flight AC991 carried passengers from Toronto to Mexico City using a similar 50/50 mix. It was the first of two commercial test flights Air Canada conducted that year. “We took 43 per cent of the carbon out of that flight,” said Teresa Ehman, the airline’s director of environmental affairs. “It was phenomenal. But it raised the next…