Final answer:
The conversion of forests to agricultural land is a key human activity negatively impacting global ecosystem stability, as it leads to habitat destruction, biodiversity loss, climate change, and ecosystem degradation.
Step-by-step explanation:
Human activities, such as deforestation for agriculture, mining, and urban development, have led to significant habitat destruction, altering the natural balance of ecosystems. The conversion of forests to farmland at a rate of approximately 13 million hectares per year has modified two-thirds of the world's forests. These actions have released synthetic organic chemicals into environments worldwide, some acting as endocrine disrupters, and contributed to biodiversity loss, climate change, and ecosystem degradation.
Climate change, driven by human technology and the exploitation of fossil fuels, is causing further ecosystem disturbances such as the depletion of the ozone layer, acid rain, and more frequent extreme weather events. These changes are likely to have long-term negative consequences on the Earth's capacity to sustain its growing human population, as well as its diverse species.