Environmental stress refers to the physical, chemical, or biological factors in the environment that can have a negative impact on living organisms. These stressors can include pollutants, extreme temperatures, lack of water, or natural disasters. Environmental stress can lead to physiological, behavioral, and ecological changes in organisms, and can ultimately impact population dynamics and ecosystem health. Research in this area aims to understand the effects of environmental stress on organisms and ecosystems, and develop strategies to mitigate these impacts and promote resilience in the face of changing environmental conditions.