Total Transportation Services plc ( TTSI ) has said it would swap its 40-strong diesel truck fleet to vehicles that run on carbon - negative , renewable natural gas . TTSI said the move would reduce nitrogen oxide emissions by 70 % and greenhouse gas emissions by over 80 % . catalyst 's programme received 25 % of its funding from the California Energy Energy Board 's California Climate Investments initiative .
Total Transportation Services Inc (TTSI) has said it will swap its 40-strong diesel truck fleet to vehicles that run on carbon-negative, renewable natural gas. TTSI said the move would reduce nitrogen oxide emissions by 90% and greenhouse gas emissions by over 80%. TTSI's programme received 25% of its funding from the California Air Resources Board's California Climate Investments initiative.