Final answer:
The two contributing factors to unhealthy soil mentioned in the article are over-fertilization and soil erosion, which are the result of modern agricultural practices.
Step-by-step explanation:
According to the referenced article, two contributing factors to unhealthy soil are over-fertilization and soil erosion. Over-fertilization, as part of modern farming methods introduced during the Green Revolution, has led to soil degradation by disrupting natural nutrient cycles and increasing soil salinity. Soil erosion, exacerbated by poor farming practices such as overplanting and lack of proper irrigation and acreage rotation, has resulted in the loss of organic matter and the disruption of the soil ecosystem.