Final answer:
The passage emphasizes that global food systems are threatened by climate change and highlights the need for sustainable food production methods and global distribution strategies to address this challenge.
Step-by-step explanation:
The main idea of the passage is that global food systems are threatened by climate change because farmers depend on relatively stable climate systems to plan for production and harvest. Climate change affects different stages of food production, including crop success, soil quality, and distribution. Therefore, sustainable food production methods and global distribution strategies need to be implemented to address the challenges posed by climate change.