It's a very clear ratio: As more land is used by people to grow crops or graze cattle or build houses or roads, less land is available to support the wild creatures who share the planet with us.
Would you like to save the species? The best long-term solution is to reverse population growth.
The fastest, most ethical and most efficient way to shrink the human population is to give women rights where they now don't have them. Read more about that here, and begin today to help make it happen.