"De-extinction" is the process of bringing back an extinct species. For many years scientists have been wondering and working towards the de-extinction of certain species. Two of the species they feel would be very important are the woolly mammoth and the passenger pigeon. These two species had a very important impact on our environments and the food chain. If scientists really believe these species could better our environment, and only do this for environmental reasons; I think they should do it.
Since there have been many great advances in genetic engineering scientists truly think this is something that could happen sooner, rather than later. There are quite a few methods they have in mind in order to de-extinct an animal. The first option is back-breeding; they would try to selectively breed until they come up with a species as closely similar to the extinct species. The second option is cloning; this process is done by taking a preserved cell from the extinct species, extracting that nucleus, and implanting that nucleus into an egg cell of a living, common species. A third and newest option is genetic engineering. This involves using the CRISPR and gene-editing tools to ultimately swap genes between the extinct species and living species.