The direct heating effects of burning fuels is at * least * a couple of orders of magnitude less. (realclimate.org)
But the SST readings are separate from the issues of urban heat effect and also show warming in the last 2 decades. (climateaudit.org)
However, the land and oceans are still relatively cool, due to spring's temperatures, so the maximum heating effect on air temperature is not felt just yet. (almanac.com)