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 abitat loss
When people cut down forests, dig mines, build cities, or make roads, they destroy habitats - the places where plants and animals live.
 ntroduced species
Seeds catch on people's clothes. Mice, rats, and birds hitchhike on ships. Snakes stowaway on airplanes. When these species land in new places, they often crowd out the species already there.
 ollution
Acid rain destroys forests. Oil spills kill coastal plants and animals. Poisons wash into waterways. Plastic trash entangles wildlife. It's easy to see how pollution is a big problem for biodiversity.
opulation growth
Nearly 6 billion people live on Earth. Each year, we add 90 million more! All these people use resources for food, water, medicine, clothes, shelter, and fuel. This leaves fewer resources for Earth's species and habitats.
 ver-consumption
Some people use more resources than others. For instance, one American uses as much energy as 422 people in Ethiopia! People everywhere must learn to reduce, reuse,
and recycle Earth's resources.
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