Detailed Explanation:

✅ Statement 1 – Correct: Global warming causes climate change, leading to habitat loss, altered precipitation patterns, and species extinction due to inability to adapt to rising temperatures.

✅ Statement 2 – Correct: Habitat fragmentation divides large habitats into smaller, isolated patches, reducing genetic diversity, disrupting migration corridors, and making populations more vulnerable to extinction.

✅ Statement 3 – Correct: Invasive alien species (e.g., Lantana camara, Water hyacinth) outcompete native species for resources, disrupt ecological balance, and cause local extinctions.

❌ Statement 4 – Incorrect: Promotion of vegetarianism reduces pressure on ecosystems by decreasing demand for livestock farming, which causes deforestation and habitat destruction—thus it benefits biodiversity, not threatens it.