Global male average height?? Well yes, if you factor in Asian men who are like 5'4 on average. But it's shorter than men in other parts of the world.
nah i think even in the most developed countries the tallest you can get is 6'0 in netherlands (and that's a self-reported one, their scientific measure is 5'11ish). but UK is like 5'10, most euro countries switch between 5'8 and 5'11. Canada is 5'9 exactly.
5'9-5'10 is pretty much the regular average. i think that's a measure for developed countries and it doesn't do it on an average basis. the problem is most people don't really know what 5'9-5'10 is anymore because most men at that height feel the need inflate by 2 inches to compensate.
the global average is more 5'8 when you count the shortest countries and add them into the average.