Coffee is one of the most popular commodities on Earth. It's grown by nearly 125 million farmers, from Latin America to Africa to Asia. But as man-made climate change warms the atmosphere, the notoriously particular coffee plant is struggling. Places like Colombia, which once had the perfect climate to grow Arabica coffee, are changing. Now, experts estimate the amount of land that can sustain coffee will fall 50 percent by 2050. It's not just a crisis for consumers but for the millions who have made a livelihood out of growing coffee.