Before departure, PM Marape said he will continue to drive the climate change effect in the Pacific island nations during the APEC Summit.
Marape was farewelled by Deputy Prime Minister John Rosso and other Government Ministers and leaders this afternoon at the APEC terminal.
Human-caused climate change is severely affecting the Pacific, from more intense tropical cyclones to changing floods and droughts.
The sea level is rising, the ocean is acidifying, and the water's surface temperature is increasing.