The following op-ed was exclusively provided to Business Insider to coincide with a speech Bill Gates is giving for the Munich Security Conference. The following is an abridged version of his remarks.

When I decided 20 years ago to make global health the focus of my philanthropic work, I didn’t imagine that I’d be speaking at a conference on international security policy. But I’m speaking here at the Munich Security Conference because I believe our worlds are more tightly linked than most people realize.

War zones and other fragile state settings are the most difficult places to eliminate epidemics. They’re also some of the most likely places for them to begin—as we’ve seen with Ebola in Sierra Leone and Liberia, and with cholera in the Congo Basin and the Horn of Africa.

It’s also true that the next epidemic could originate on the computer screen of a terrorist intent on using genetic engineering to create a synthetic version of the smallpox virus . . . or a super contagious and deadly strain of the flu.

The point is, we ignore the link between health security and international security at our peril. Whether it occurs by a quirk of nature or at the hand of a terrorist, epidemiologists say a fast-moving airborne pathogen could kill more than 30 million people in less than a year. And they say there is a reasonable probability the world will experience such an outbreak in the next 10-15 years.

It’s hard to get your mind around a catastrophe of that scale, but it happened not that long ago. In 1918, a particularly virulent and deadly strain of flu killed between 50 million and 100 million people.

You might be wondering how likely these doomsday scenarios really are. The fact that a deadly global pandemic has not occurred in recent history shouldn’t be mistaken for evidence that a deadly pandemic will not occur in the future.

And even if the next pandemic isn’t on the scale of the 1918 flu, we would be wise to consider the social and economic turmoil that might ensue if something like Ebola made its way into a lot of major urban centers.

The good news is that with advances in biotechnology, new vaccines and drugs can help prevent epidemics from spreading out of control. And, most of the things we need to do to protect against a naturally occurring pandemic are the same things we must prepare for an intentional biological attack.

We need to invest in vaccine innovation

First and most importantly, we have to build an arsenal of new weapons—vaccines, drugs, and diagnostics.

Vaccines can be especially important in containing epidemics. But today, it typically takes up to 10 years to develop and license a new vaccine. To significantly curb deaths from a fast-moving airborne pathogen, we would have to get that down considerably—to 90 days or less.

We took an important step last month with the launch of a new public-private partnership called the Coalition for Epidemic Preparedness Innovations. The hope is that CEPI will enable the world to produce safe, effective vaccines as quickly as new threats emerge.

The really big breakthrough potential is in emerging technology platforms that leverage recent advances in genomics to dramatically reduce the time needed to develop vaccines. Basically, they create a delivery vehicle for synthetic genetic material that instructs your cells to make a vaccine inside your own body. And the great thing is that once you’ve built a vaccine platform for one pathogen, you can use it again for other pathogens—which means we could also apply it to other hard-to-treat diseases like HIV, malaria, and tuberculosis.

Of course, the preventive capacity of a vaccine won’t help if a pathogen has already spread out of control. Because epidemics can quickly take root in the places least equipped to fight them, we also need to improve surveillance.

That starts with strengthening basic public health systems in the most vulnerable countries. We also have to ensure that every country is conducting routine surveillance to gather and verify disease outbreak intelligence.

Bill Gates Dave Thompson - WPA Pool /Getty Images And we must ensure that countries share information in a timely way, and that there are adequate laboratory resources to identify and monitor suspect pathogens.

The third thing we need to do is prepare for epidemics the way the military prepares for war. This includes germ games and other preparedness exercises so we can better understand how diseases will spread, how people will respond in a panic, and how to deal with things like overloaded highways and communications systems.

We also need trained medical personnel ready to contain an epidemic quickly, and better coordination with the military to help with logistics and to secure areas.

It is encouraging that global alliances like the G7 and the G20 are beginning to focus on pandemic preparedness, and that leaders like Chancellor Merkel and Prime Minister Solberg are championing health security.

But there isn’t enough money to help the poorest countries with epidemic preparation. The irony is that the cost of ensuring adequate pandemic preparedness worldwide is estimated at $3.4 billion a year—yet the projected annual loss from a pandemic could run as high as $570 billion.

The pandemic is one of the 3 biggest threats the world faces

Bill Gates believes climate change, nuclear war and pandemics are the three biggest world threats. Andrew Burton/Getty When I was a kid, there was really only one existential threat the world faced. The threat of a nuclear war. By the late 1990s, most reasonable people had come to accept that climate changed represented another major threat to humankind.

I view the threat of deadly pandemics right up there with nuclear war and climate change. Innovation, cooperation, and careful planning can dramatically mitigate the risks presented by each of these threats.

I’m optimistic that a decade from now, we can be much better prepared for a lethal epidemic—if we’re willing to put a fraction of what we spend on defense budgets and new weapons systems into epidemic readiness.

When the next pandemic strikes, it could be another catastrophe in the annals of the human race. Or it could be something else altogether. An extraordinary triumph of human will. A moment when we prove yet again that, together, we are capable of taking on the world’s biggest challenges to create a safer, healthier, more stable world.