Final answer:
Agriculture introduced risks such as increased disease spread, especially malaria in certain regions, and economic instability due to weather dependence and crop failures.
Step-by-step explanation:
The novel risk that agriculture brought for people included an increased vulnerability to health and disease challenges. A more sedentary lifestyle and higher population densities in agricultural communities created conditions where diseases could spread more easily and become endemic. One specific example is how the introduction of slash-and-burn agriculture in tropical and subtropical regions facilitated the spread of malaria by increasing human contact with mosquito breeding grounds. Additionally, farmers were more susceptible to the whims of weather, and crop dependency heightened this risk, often leading to economic instability and social stratification.