Human activities have a big effect on nature. This includes everything from individual animals to large ecosystems and biomes.

1. Individual Level:

   • When we destroy habitats, it hurts individual species. About 80% of land habitats have been changed by people, which stresses animals and makes it harder for them to survive.

2. Population Level:

   • Taking too many resources has caused some animal populations to drop. For example, around 33% of fish populations are overfished. This changes how marine animals live together.

3. Community Level:

   • Invasive species, which are often brought in by humans, can mess up local communities. The National Park Service says that invasive species threaten 42% of endangered species in the U.S., which reduces biodiversity.

4. Ecosystem Level:

   • Pollution and climate change harm the health of ecosystems. In the U.S., more than half of rivers and lakes are polluted. This damages aquatic ecosystems and affects the variety of species.

5. Biome Level:

   • Climate change also affects biomes around the world. A group called the Intergovernmental Panel on Climate Change (IPCC) predicts that temperatures will rise between 1.5°C and 2°C by 2050. This will dramatically change habitats and where species live.

In short, what humans do has wide-ranging effects on nature. This leads to less variety in species and weaker ecosystems.