Final answer:
The habitat loss of terrestrial species is primarily due to habitat destruction and fragmentation, overexploitation, pollution, introduction of non-native species, and disease, but not directly due to climate change as of previous data.
Step-by-step explanation:
The habitat loss of terrestrial species can be attributed to several factors, including habitat destruction, habitat fragmentation, overexploitation, pollution, introduction of non-native species, and diseases. However, as indicated in the materials, climate change, while an emerging threat, has not yet been included as a major reason for the decline of terrestrial species up to this point, suggesting that up to the time of the studies, it was not directly implicated in the magnitude of losses observed due to habitat destruction and other factors. The human-driven causes of habitat loss—like deforestation for agriculture or urban development—have led to a significant decline in biodiversity and contribute to the fragmentation and degradation of ecosystems that are crucial for species survival.