And how do you explain that basically every village in the European Alps (or any other mountain range) has old pictures of how their glacier looked ~100 years a

And how do you explain that basically every village in the European Alps (or any other mountain range) has old pictures of how their glacier looked ~100 years ago, where you also see how much lower the tree line was etc. Or all the local legends about winter activities that somehow would never be possible nowadays. There is always some level of fraud in any scientific (or human) discipline but not on such a global scale.