There is a coffee crisis brewing, SciDev.Net recently reported in a story about the effects of climate change on the crop, primarily the highly prized Arabica coffee beans. A major study modelled 21 scenarios of climate change up to 2050 on a band of 60 tropical countries either side of the equator where Arabica coffee is grown. 
Although 2050 sounds far ahead, it takes three to five years to get a first crop. And coffee planted now should be productive for much of the 2020-50 period.
The common-sense view is to say: “Big food companies will be able to get coffee from somewhere — after all, Vietnam developed a coffee industry quickly.” Or: “Even if there is a couple of degrees of warming, farmers can just grow the coffee higher up the mountains.”