That was my guess due to the fact that he linked to a city in Mongolia (Uaaalmoola LOL) that is said to be among the world’s coldest national capitals. So it must be weather related in my thinking and thus tied to global warming or lack thereof.
My guess is that they are inspirational pictures. The next mountain to climb and all that.
Just because they are pyramids and were once landing zones for alien beings has nothing to do with it.