What is the last thing you learned or discovered?

When the Himalayan mountains lose the last of their glaciers, as they are on course to do in the next hundred or so years, the drinking water for an entire subcontinent of nearly two billion people disappears. All of these people will have to leave their homes if they're lucky enough to be able to do so, or die of thirst. An entire civilization will be uprooted, with all its history, landmarks, holy places, and more left behind in what will eventually become a desert.