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Typhoon survivors await relief supplies Monday at the airport in Tacloban, Philippines. The disastrous storm highlights the Pacific nation’s vulnerability to natural disasters.

Experts: Man, nature to blame for typhoon

– Nature and man together cooked up the disaster in the Philippines.

Geography, meteorology, poverty, shoddy construction, a booming population, and, to a much lesser degree, climate change combine to make the Philippines the nation most vulnerable to killer typhoons, according to several scientific studies.

And Typhoon Haiyan was one mighty storm.

Haiyan slammed the island nation with a storm surge two stories high and some of the highest winds ever measured in a tropical cyclone – 195 mph as clocked by U.S. satellites, or 147 mph based on local reports. An untold number of homes were blown away, and thousands of people are feared dead.

“You have a very intense event hitting a very susceptible part of the world. It’s that combination of nature and man,” said MIT tropical meteorology professor Kerry Emanuel. “If one of those ingredients were missing, you wouldn’t have a disaster.”

The 7,000 islands of the Philippines sit in the middle of the world’s most storm-prone region, which gets some of the biggest typhoons because of vast expanses of warm water that act as fuel and few pieces of land to slow storms down.

Half the storms on an informal list of the strongest ones to hit land in the 20th and 21st centuries ended up striking the Philippines, according to research by Jeff Masters, meteorology director of the Weather Underground.

Storms often hit after they’ve peaked in strength or before they get a chance to, but Haiyan struck when it was at its most powerful, based on U.S. satellite observations, Emanuel said.

Humans played a big role in this disaster, too – probably bigger than nature’s, meteorologists said. University of Miami hurricane researcher Brian McNoldy figures that 75 percent to 80 percent of the devastation can be blamed on the human factor.

Meteorologists point to extreme poverty and huge growth in population – much of it in vulnerable coastal areas with poor construction, including storm shelters that didn’t hold up against Haiyan.

More than four out of 10 Filipinos live in a storm-prone vulnerable city of more than 100,000, according to a 2012 World Bank study. The Haiyan-devastated provincial capital of Tacloban nearly tripled from about 76,000 to 221,000 in just 40 years.

About one-third of Tacloban’s homes have wooden exterior walls. And one in seven homes have grass roofs, according to the census office.

Those factors – especially flimsy construction – were so important that a weaker storm would have still caused almost as much devastation, McNoldy said.

“You end up with these kind of urban time bombs, where cities have doubled, tripled, quadrupled in size in 50 years” without good building standards, said Richard Olson, director of the Extreme Events Institute at Florida International University. “It is, I hate to say, an all-too-familiar pattern.”

A 2008 study found that in the northwestern Pacific where Haiyan formed, the top 1 percent of the strongest tropical cyclones over the past 30 years are getting on average about 1 mph stronger each year – a phenomenon some scientists suspect is a consequence of global warming.

“The strongest storms are getting stronger,” said study co-author James Kossin of the National Climatic Data Center. Haiyan “is what potentially could be a good example of the kind of the things we’re finding.”

Similarly, the Philippines has seen its sea rise nearly half an inch in the past 20 years – about triple the global increase, according to R. Steven Nerem of the University of Colorado. Higher sea levels can add to storm surge.

“The Philippines is one of the most disaster-prone places on Earth,” said Kathleen Tierney, director of the Natural Hazards Center at the University of Colorado. “They’ve got it all. They’ve got earthquakes, volcanoes, floods, tropical cyclones, landslides.”

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