The answer suggests that the situation could have been prevented by implementing better planning, better rotation, and better conservation practices. These measures would have helped in managing resources more effectively, ensuring proper utilization of land, and preserving the environment. It implies that with improved planning and conservation strategies, the negative consequences could have been avoided or minimized. The inclusion of "less sheep" and "younger farmers" in the options might indicate potential factors that could contribute to better planning, rotation, and conservation practices, rather than standalone preventive measures.