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Lions may not be kings of Africa鈥檚 wild for much longer.聽

Populations are declining across much of the continent, with dismal predictions for the future, according to a study聽published Monday in the journal Proceedings of the National Academy of Sciences.

Most African lion populations have been cut in half over the past two decades and that is expected to continue.

The lion populations in West and Central Africa may be halved again in the next 20 years. And East Africa, lions鈥� long-time kingdom, will not be left untouched either.

Previously, scientists thought East Africa was a shining example of wild lion populations.聽

鈥淚t turns out that was a flawed assumption,鈥� a study author and president of the conservation organization Panthera Luke Hunter told Scientific American. 鈥淭here are excellent lion populations that are doing well in East Africa, but it turns out that they鈥檙e the exception, not the rule.鈥�

Of 47 lion populations studied across Africa, the researchers found that almost all were in sharp decline. They calculated a 67 percent chance that lion populations in West and Central Africa will be cut in half again in the next 20 years. In Eastern Africa, that chance is 37 percent.

Some may even disappear entirely, according to Dr. Hunter. 鈥淭he human pressure is too great,鈥� he said.

Only four southern African countries are seeing increases of lions: Botswana, Namibia, South Africa, and Zimbabwe. But unlike wild populations in other regions, these lions are living on fenced conservation lands.

鈥淚f resources for wild lands cannot keep pace with mounting levels of threat, the flagship species of the African continent may cease to exist in many countries,鈥� lead author Hans Bauer of WildCRU said in a news release.

Lions lived in almost all parts of the world up until about 11,000 years ago, according to Philipp Henschel, lion survey coordinator for Panthera and an author of the study.

Now, lions are only spotted in Africa and India. And lions in India number just about 500.聽

In Africa, the wild population of lions may not even reach 20,000. 聽

So what threatens these big cats?

Increased hunting of wild game meat has left little for the lions to prey on.聽

As a result, their next meal may conflict directly with humans鈥� as the lions turn to livestock. Farmers feel threatened and retaliate by killing the hungry cats, said Hunter.

Conservation lands like those in southern Africa could offer a solution, but some regions may not even have the habitat to create such reserves. It might already be gone.

鈥淭he sad thing is there are really very few opportunities to replicate that elsewhere in Africa,鈥� Hunter said.

鈥淲e鈥檝e got a huge amount of work ahead of us,鈥� he said. 鈥淚t鈥檚 not just about lions. It鈥檚 about protecting these massive, iconic African landscapes. If we get it right, lions respond very quickly and African woodland savannahs can recover very quickly. They鈥檙e incredibly resilient.鈥�

But even conservation may not be sufficient. Paul Funston, senior director聽of Panthera's Lion Program, said in the release, "If we don't address these declines urgently, and at a massive scale, the intensively managed populations in southern Africa will be a poor substitute for the freely roaming lion populations in the iconic savannahs of East Africa. In our view, that鈥檚 not an option."

Lions are currently listed as vulnerable on the聽International Union for Conservation of Nature and Natural Resources' red list. That list focuses on global trends, but the authors of this study recommend that lion's status be regional. As such, they suggest that lions be considered endangered in Central and East Africa.

"We have to confront that reality," Hunter told the Associated Press. "Lions and people both evolved in Africa and co-existed for millennia, but today, one is losing the race for survival."

This report contains material from the Associated Press.