Thailand is already struggling to cope with the environmental impact of a tourism boom that’s expected to lure 40 million visitors this year.

The influx is on course to hit 65 million a decade from now, signaling an even bigger challenge ahead.

Southeast Asia’s second-largest economy plans to pour about $13 billion into expanding airport capacity and connecting major terminals with high-speed railways.

As a result, foreign tourist numbers could jump more than 60 percent by 2029 to about the size of the UK population, projects the World Travel and Tourism Council.

Tourism is economic lifeblood for Thailand, and the sheer number of visitors is a reason the nation has Asia’s strongest currency this year.

Yet the environmental challenge of coping with the deluge is multiplying, exemplified by the indefinite closing of the iconic Maya Bay — made famous by the Leonardo DiCaprio movie The Beach —- to allow its ecosystem to recover.

“The number of tourists is growing too fast for what the country can handle,” said Somprawin Manprasert, chief economist at Bank of Ayudhya, a Thai unit of Mitsubishi UFJ Financial Group.

“We have to implement a better system to manage tourists and destinations, which could help with congestion and environmental problems. We don’t see enough of this being done yet.”

Thailand isn’t alone in facing the fallout of mass tourism, ranging from coral damage to the plastic, garbage, and sewage pollution in the sea.

Neighbors including the Philippines and Indonesia face similar challenges.

The difference for Thailand is that tourism on some measures accounts for a fifth of the economy, making management of the sector a crucial issue for the nation’s outlook.

Arrivals have moderated in recent months, a blip officials view as temporary amid a cooling global economy.

Officials have tried for years to entice travelers to less visited parts of the country, to ease pressure on traditional hotspots such as the capital Bangkok and beach resorts like Phuket. Those initiatives were only partially successful.

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