There are many ways conservation biologists are addressing the extinction crisis. These include things like establishing protected areas where wildlife habitat is preserved or restored or developing new ways to farm, log, and graze livestock, that preserve habitat values.
Educating citizens about the importance of conserving wildlife and things they can do to help wildlife and the environment is important. As is encouraging changes in production and consumption that foster resource conservation and reduce waste and pollution, through legal or economic incentives.
Enacting and enforcing laws and international treaties that regulate exploitation of wildlife and wildlife trade takes time but can have a significant impact on how countries around the globe treat the species found within their boundaries.
Establishing captive breeding programs for species whose populations have been so depleted that they need human help to increase their numbers and genetic diversity; Providing alternatives to local people who are dependent on wildlife and forests for food and fuel.
Also, encouraging family planning to reduce human population growth would help as well.