Not anytime soon, but maybe eventually global warming could effect the French fry supply. Here's the logic.
The Russet Burbank is a potato variety grown in North America which is widely used to make French Fries, and is believed to be the type of potato McDonald’s uses. But, farmers in the potato-growing state of Idaho rely on water from melting snow in the mountains to water the crop, and climate change is leading to less snow that melts more quickly, negatively affecting the growth of the potatoes.
There is good news though. Researchers have already started working on creating hybrid potato varieties which are more resistant to climate change.