In short, we aren't on track to an apocalyptic extinction, and the new head is concerned that rhetoric that we are is making people apathetic and paralyzes them from making beneficial actions.
He makes it clear too that this doesn't mean things are perfectly fine. The world is becoming and will be more dangerous with respect to climate. We're going to still have serious problems to deal with. The problems just aren't insurmountable and extinction level.
Perhaps I too failed basic chemistry, but I do believe you are grossly incorrect -- maritime shipping is a massive contributor to CO2 emissions:
Ships release about 1 billion metric tons of carbon dioxide into the atmosphere each year, according to the IMO, roughly equal to Texas and California’s combined annual carbon output.
Marine transportation is one of the contributors to world climate change. The shipping industry contributes 3.9% of the world’s carbon dioxide output equivalent to 1260 million tons of CO2 and this is one of the large sources of anthropogenic carbon emitters.