Climate change and world record atmospheric carbon dioxide concentrations are not new topics in mainstream media. An ample source of information on the planet’s current and future conditions is at our fingertips, but a resounding question from curious minds and climate-change deniers alike is: How do we know the climate is changing? We might have a long list of weather patterns at locations around the world, but how do we get them? And how do we make predictions? The answer would be flux towers.