Question

what is the main reason for changing the use of pesticides over time?
to reduce water consumption
to save farmers money
environmental and health concerns
to experiment with different chemicals

Explanation:

Pesticides can have harmful effects on the environment (such as contaminating soil and water) and on human health (e.g., through exposure and potential long - term health risks). Over time, as these negative impacts became more understood, there was a shift in pesticide use. Reducing water consumption is not the main driver for pesticide use change. Saving farmers money might be a secondary consideration but not the main reason. Experimenting with different chemicals is more of a means rather than the main reason. The key has been the growing awareness of environmental and health concerns.

Answer:

environmental and health concerns