Special Note: Please note that this scenario is meant to be read as entertainment, not as an accurate prediction of the future. Also note that the viewpoints and opinions that may come across in this scenario are not necessarily the viewpoints and opinions of the author.
Someday, we'll be able to use the DNA of active animals to bring the extinct animals back to life. This holds true in the Jurassic Park trilogy where they used bird and reptile DNA to bring the dinosaurs back to life. Most members of the Global Intellectual South find this theory to be psuedo-science and condemn the producers of the documentaries that suggests that birds can be turned back to dinosaurs by simply tweaking their DNA.
By the year 2030, scientists will be challenged by environmentalists to bring Alaotra Grebe back from extinction. The Alaotra Grebe may have been completely wiped out in 2010 but we can use DNA from closely related creatures and splice them together in the hopes of recreating the Alaotra Grebe. Someday, humans will leave the earth for colonies on other planets; turning the entire Earth into a nature preserve. Nanobots will play a role in stopping global warming. UV levels will become the lowest since the 16th century. A lot of people who have the money to create these kinds of preserve are mostly motivated by scientific theories and visionaries like Michael Crichton and Raymond Kurzweil.
Once renewable energies have replaced fossil fuels and coal due to the high cost of non-renewables in the future, there will be no more threats to wild animals. The price of regular gasoline for cars may exceed $2.10/litre in parts of the North American continent by 2024; forcing the government to expedite research into hydrogen fuel. However, the DNA of animals still remaining will be spliced together to bring back animals that have died since the 1500s and earlier. Oil spills will become a thing of the past and the anti-wind turbine conservatives will have long died of their cancers and diseases caused by fossil fuel-related pollution. Attemps to bring "formerly extinct animals" out of the preserve and back into the wild will fail at first but ultimately succeed.
The ideal location for an extinct animals' preserve is in a warm climate with very little future threats from sea level rise. Also, there must be little or no interference from humans and motorized vehicles. The Year 2038 bug will make gas-guzzling vehicles and energy inefficient electronic devices inoperable; this will also help to drastically lower carbon dioxide levels that would prevent an extinct animals' preserve from thriving.