(Portland, OR) -- It's been a year since TriMet switched its buses to renewable diesel. R99 is a blend of 99-percent renewable diesel and one-percent petroleum. The 700 buses have burned more than five-million gallons of R99 diesel since December 2, 2021. The move to renewable diesel, combined with a shift to renewable electricity for the MAX light rail system have reduced TriMet's greenhouse gas emissions by nearly 70-percent. More than 193-million pounds of greenhouse gas emissions were eliminated which is like taking nearly 19-thousand automobiles off the road every year.