According to foreign media reports, the science fiction film Jurassic Park has made an important contribution to resurrecting dinosaur species that were extinct tens of millions of years ago. However, although these sci-fi plots are obviously not realistic, reviving the dinosaur is only the first step to maintain a dinosaur park “Jurassic Park” films, as well as “new Jurassic world: Camping Cretaceous” and other films and TV works clearly show that running dinosaur themed parks is a very difficult thing, but you have to worry about not only to avoid resurrected dinosaurs devouring tourists, you have to make these prehistoric species survive in the modern world, which is more difficult than you think. Of course, in order to make the extinct dinosaurs return to the earth, the first obstacle to overcome is to reconstruct their DNA. At present, the relevant technology is impossible in scientific theory. Dinosaurs have been extinct for tens of millions of years, and their DNA will not last for such a long time. Fossil records show that dinosaur DNA can be preserved for up to 1 million years. However, it is not enough to revive the dinosaurs that were extinct 65 million years ago. It is not necessary to find the DNA of dinosaurs in Jurassic period. We have to span a longer historical period. < / P > < p > for the sake of discussion, we assume that the conditions for resurrecting dinosaurs are now available. In a laboratory on a remote island, scientists are engaged in secret experiments to cultivate baby dinosaurs. At this point, a second persistent problem began to emerge: how to let these dinosaur babies survive, and live happily and healthily! < / P > < p > of course, once we do our best to bring an extinct species back to the surface of the earth, we have an obligation to protect and take care of them. The problem is that it may be beyond our ability to do so. < / P > < p > for carnivorous dinosaurs, looking for food is not a big problem. In the Jurassic Park series, carnivorous dinosaurs attack humans, and the recent broadcast of “new Jurassic world: Camping Cretaceous” is the same. In most cases, “meat is meat”. Velociraptors, taurosaurs, Tyrannosaurus Rex and other predators like the cattle that people feed However, for a complete family of dinosaurs, herbivorous dinosaurs find it difficult to find food. < / P > < p > the main problem is that the earth’s ecosystem has undergone dramatic changes in the past 100 million years. There is a big difference between the Mesozoic plants and today’s plants. This is not to say that the giant sauropods can’t find food in the modern world, but their life will be very difficult. < / P > < p > first of all, there is evidence that there were more plants in the dinosaur era. Scientists believe that in the distant past, due to the higher carbon dioxide index of the earth’s atmosphere, plants were able to capture more energy, so trees grew very luxuriantly. This abundance of plants is thought to be one of the main reasons why sauropods were so large. < / P > < p > although it is difficult to know exactly how sauropods used to eat, scientists speculate that they like conifers, but conifers are unique to the fictional Jurassic Park in Costa Rica, and are not unique to remote islands such as the imaginary nabral island. < / P > < p > there are many plants in the modern tropical regions of the earth, but it is not clear whether sauropods could recognize them and use them as food. Given the amount of nutrition needed to feed such a large animal, let alone sustain the entire dinosaur population, it is likely that they starved to death in the accumulated food. < / P > < p > one of the side effects of global plant proliferation is the significant increase of oxygen in the atmosphere, and some assessment data indicate that oxygen content may exceed the current 35% in part of the Mesozoic era. < / P > < p > all the oxygen released by plants was concentrated in the atmosphere, making the atmosphere thicker than it is today. The thicker atmosphere and higher oxygen content may be one of the reasons for the large size of some species, especially the large flying insects, which use the atmospheric conditions to grow larger than modern similar organisms. < / P > < p > at present, the oxygen content in the earth’s atmosphere is 21%, which is nearly half of the peak value of oxygen content hundreds of millions of years ago. By comparison, this difference is equivalent to the oxygen content in the base camp of Mount Everest and the oxygen content in the zero altitude area. < / P > < p > all of this means that sauropods living in modern Jurassic theme parks are uncomfortable with the air they breathe and may not be able to survive for a long time. Modern dinosaurs could have lived in very small spaces, and even if they were allowed to roam freely across the island, large herbivores were likely unable to find food, and they were short of breath all the time. < / P > < p > for humans, if dinosaurs are resurrected and returned to the earth after tens of millions or hundreds of millions of years after their extinction, it will be an exciting and enlightening thing, but they will arrive at a completely different new world. The earth today is not their world, it is a world that they can’t adapt to. < / P > < p > to create a theme park that allows ancient creatures to live comfortably, it needs to be as close to their ancient environment as possible, including the climate, plant environment and atmospheric conditions they are used to. At present, whether scientists have the ability to revive long extinct dinosaurs is still an unknown mystery, but to borrow Ian Malcolm’s words, it is obvious that we should not revive dinosaurs, not for us, but for them! More Samsung devices can now run Android applications on PC through your phone