What are the five main human-driven causes of biodiversity loss?

Researchers have identified five primary human-driven factors that contribute to the global loss of biodiversity:1

• Habitat loss and degradation: This involves the thinning, fragmentation, or destruction of natural environments—often for agriculture, urban development, or resource extraction—which eliminates the living space and food resources necessary for species survival.12
• Invasive species: These are non-native organisms that disrupt ecosystems by outcompeting indigenous species for essential resources, often leading to population declines or localized extinctions.13
• Overexploitation: This occurs when species are harvested, hunted, or fished at rates that exceed their ability to reproduce and replace their numbers, eventually depleting populations to unsustainable levels.14
• Pollution: The introduction of harmful substances or energy into the environment at rates faster than they can be diluted or decomposed creates health and reproductive problems for organisms, often simplifying and impoverishing ecosystems.15
• Climate change: Driven by human activities such as the burning of fossil fuels, global warming alters temperature and precipitation patterns, forcing species to adapt to conditions that may exceed their biological tolerance limits.1