> Do you have any idea how much of the earth's land surface (to say nothing of its enormous oceanic heat sink) was covered by temperature observation before 197

> Do you have any idea how much of the earth's land surface (to say nothing of its enormous oceanic heat sink) was covered by temperature observation before 1979? Let's apply your rigorous scientific standard and see if we can figure out how much of earth's surface was covered by ocean in 1979... hmm... well we have no satellite observations. We have a decent amount of maps, but, those are just from scattered naval mapmaking activities, really only engaged in by a handful of countries across the entire globe. I'm not convinced the ocean was all that vast before 1979. Do you have better evidence? How do you even know how deep it may have been? What, from a couple depth readings here and there over a few centuries? Sorry, it's going to take more than that to convince me.