Ships push more heat into than out of the ocean – A major source of global warming since industrialization.
Prof. Curry’s starting point is a reference to the IPCC AR5 (Report 2013) which concluded that:
“It is extremely likely that more than half of the observed increase in global average surface temperature from 1951 to 2010 was caused by [humans]. The best estimate of the human induced contribution is similar to the observed warming over this period.”
It is little Prof. Curry offers herself to contribute on her question where the heat is coming from. Neither does Willies Eschenbach who stress that nobody knows much about the up-and-down since the Romans, but that “ … none of those gradual temperature changes were caused by variations in CO2”. Subsequently he mentions that the sun is the source of all heat, but stress univocal: