The primary cause of biodiversity loss across the globe is habitat destruction, primarily due to human activities like deforestation, urbanization, and agricultural expansion. These activities lead to the fragmentation of ecosystems and eliminate species' natural habitats, causing numerous plants and animals to face extinction. Other contributing factors include pollution, overexploitation, and climate change, which further compromise ecosystems. Conservation efforts and sustainable practices are essential to mitigate these impacts and preserve the Earth's biodiversity for future generations.