Climate change affecting Vic fire effort

Climate change is affecting Victoria's emergency services, including access to internationally-shared firefighting aircraft, a parliamentary inquiry has been told.

Emergency Services Minister James Merlino told a budget estimates hearing on Wednesday the state's fire season was starting earlier, lasting longer, was more intense and the state needed more aircraft.

"It's getting quite challenging in terms of our aviation fleet and those large air tankers ... those planes fly around the world, (in) the northern hemisphere they want and need to keep the planes for a longer period of time, we want and need those planes earlier," he said.