Final answer:
The author of 'Healthy Diets from Sustainable Sources Can Save the Earth' supports her main point with research-based sources as evidence, particularly in the conclusion where she restates the thesis and summarizes the supporting evidence. The author supports their main point with evidence when discussing the need for more evidence to support a conclusion.
Step-by-step explanation:
In the passage, the author supports their main point with evidence when they state, "This person draws the conclusion that the restaurant is bad from two instances of eating there. But two instances are not enough to support such a robust conclusion." Here, the author is using the example of someone forming a strong opinion about a restaurant based on limited experiences to demonstrate the need for more evidence to support a conclusion.