Current farmer. Natural disasters destroy the land. And then nothing grows.

If there was an earth quake, the land gets disrupted (tore apart, split, etc) and you either can't plant into the empty spaces, or need to work the ground which would've taken ages to do back then with animals and small equipment. Large volcanic eruptions have the ash which smothers the land until it floats away or is worked into the ground, and the cooled magma turns into rock which you can't plant into.

Droughts don't just mean lack of water, but rock hard dry earth that you can't plant into. Too wet means plants drown, or quagmires you simply can't get into to plant. Too cold to plant on time means late crops, and if they do get going, your yeilds are reduced because of the shorter growing season.

All of this usually means weaker plants, which are more susceptible to diseases. The plants are not as nutritious, making you weaker and more susceptible to your own diseases. Diseases spread, more people get sick, especially if they're also not getting enough nutrition themselves.

Current farmers still face a lot of stuff from natural disasters. But we do get some lucky breaks now with our current technology (like weather forecasting), equipment size/strength, and how much faster we can do things. And we have also gotten better at producing higher yields of crops, and preventing plant diseases, which ensures the health of animals and people. So humans can flourish, be strong, and thrive.