Glance at a list of recent travel trends and you’ll be struck by something. Where we visit, the ways we get there, and what we do upon arrival are all shaped by events in the wider world. Climate change expands the channels navigable by cruise ships. The legalization of marijuana begets a cannabis tourism industry. New technology quickly finds its way into apps and doodads for the road. Though we sometimes think of vacation as a break from everything else, it’s impossible to divide things up as neatly as that. Travel is affected by the news.