HUMAN INDUCED CAUSES OF EXTINCTION

Current rates of human-induced extinctions are estimated to be about 1,000 times greater than past natural (background) rates of extinction, leading some scientists to call modern times the sixth mass extinction.

 This high extinction rate is largely due to the exponential growth in human numbers: growing from about 1 billion in 1850, the world’s population reached 2 billion in 1930 and more than 7.8 billion in 2020 and is expected to reach about 10 billion by 2050. As a result of increasing human populations, habitat loss is the greatest factor in current levels of extinction. 

Here we take a look at some of the human-induced causes of extinction: 

1. Over harvesting 

Humans use thousands of the world’s species in their daily lives for food, shelter, and medicine. But these natural resources are limited. People can take only so many fish from the sea or cut down so many acres of forests without permanently damaging ecosystems and threatening species. For many species, this “overharvesting” may mean total extinction.

2. Habitat Loss 

When people cut down forests, build cities, or make roads, they destroy habitats–the places where plants, animals, and other organisms live.

3. Pollution 

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.

Thank you Ted Decker from our Facebook Family for your input: 

"The mere fact that today we are surrounded by all animals, prove they have survived climate change for 4 million years. I don't think we have to worry. The problem is that man's garbage is contributing to the escalation of the process, not causing it." 

REFERENCE: 

John L. Gittleman

Dean of the graduate faculty at the University of Georgia's Odum School of Ecology. Editor of Carnivore Behavior, Ecology, and Evolution; co-editor of Carnivore Conservation.