What defines land degradation?

Land degradation is primarily characterized by the deterioration of land quality and quantity. This deterioration can manifest through various forms, such as soil erosion, nutrient depletion, desertification, and loss of biodiversity. When land quality degrades, it can lead to a decline in the land's ability to support crops, maintain healthy ecosystems, and provide resources for local communities.

In contrast, increases in agricultural productivity, improvements in soil quality, or the complete recovery of native habitats do not represent land degradation. These aspects reflect positive changes that enhance land conditions and its capacity to support life and agriculture. Therefore, option C aptly highlights the negative trend of land degradation, which is crucial for understanding environmental impacts and sustainable land management practices.