Question: what are 5 things that can reduce biodiversity?
Answer: Climate change. Changes in climate throughout our planet's history have, of course, altered life on Earth in the long run — ecosystems have come and gone and species routinely go extinct. ... 
Deforestation and habitat loss. Image: Nelson Luiz Wendel / Getty Images. ... 
Overexploitation. ... 
Invasive species. ... 
Pollution.