Which of the following is a main cause of biodiversity loss globally?

The main cause of biodiversity loss globally encompasses a variety of interrelated factors, and in this case, "All of the above" is the correct choice because each of the listed options contributes significantly to the decline of biodiversity.

Climate change affects ecosystems by altering temperature and precipitation patterns, which can shift habitats and disrupt the balances within ecosystems. Species that cannot adapt quickly enough to these changes may face extinction.

Overfishing severely depletes fish populations, which can lead to imbalances in aquatic ecosystems. It not only affects the targeted fish species but also impacts those that depend on them for food, thereby influencing the overall health of marine biodiversity.

Deforestation leads to habitat loss for countless species, as forests sustain a vast array of organisms. When forests are cleared for agriculture, urban development, or other purposes, the natural habitats of many species are destroyed, leading to decreased population numbers and increased extinction rates.

Since each of these factors plays a critical role in threatening wildlife and ecosystems, their combined impact is a major driving force behind the global loss of biodiversity. Thus, recognizing that all of these elements contribute to the issue is essential for understanding the complexities of environmental challenges and the need for comprehensive conservation efforts.