The tourism industry is booming throughout the world but nowhere more noticeably than on the small tropical islands of Southeast Asia. Millions of tourists flock to these remote islands every day to enjoy the beaches and snorkel among the coral reef, but the traffic and waste they produce has forced some ecosystems to reach their breaking point.

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“Overtourism” is the new term for the overpopulation of tourists who wreak havoc on fragile ecosystems. Many Asian governments have had to close entire islands in order to allow habitats and species (like sharks and sea turtles) to rehabilitate.

Sailboats and tourists at the shores of Boracay

The environmental impact of overtourism

The primary reasons that mass tourism negatively impacts the environment include:

Discharge of human waste directly into the ocean by boats, cruise ships and hotels

A government survey in the Philippines revealed that 716 out of 834 businesses on the famous Boracay Island did not have wastewater permits and were indiscriminately dumping sewage and waste into the water. Cruise ships, private yachts and many hotels along the coasts also dump waste directly into the ocean.

Toxic chemicals from sunscreens pollute young coral species

Sunscreens that contain oxybenzone and octinoxate have been found to alter the DNA of young corals, prohibiting normal and healthy growth.

Related: Hawaii bans reef-killing chemical sunscreens

Massive amounts of garbage and plastic pollution

According to the Ocean Conservancy, China, Indonesia, the Philippines, Vietnam and Thailand are responsible for up to 60 percent of all plastic pollution in the ocean. Globally, eight million tons of plastic enter the ocean every year.

Related: New study reveals microplastics are in the air

Unsustainable development and the destruction of key habitats, like mangroves

Almost 50 percent of all mangrove forests have been destroyed in countries including India, the Philippines and Vietnam. Mangroves are systematically cleared to make way for hotels, resorts and white sand beaches, but healthy mangroves are an essential part of healthy coastal ecosystems. Mangroves protect beaches from erosion and provide critical nursery and breeding grounds for young fish and other species.

tourists covering a beach the Philippines

Why are there so many tourists?

The rapid rise in tourism is mostly because of expanding middle classes in many countries. More people are able to afford vacations and travel, particularly in China. In 2018, Chinese citizens made a total of 150 million trips abroad, compared to just 10 million in 2000. Regardless of the origin of the tourists, Pacific islands’ infrastructure and ecosystems are unable to handle the surge and are in desperate need of regulation and management.

“I would argue that tourism has not only been badly managed in general, it’s not been managed at all,” said Randy Durband, chief executive officer of the Global Sustainable Tourism Council.

tourists and tour boats covering Maya Bay

Islands close their borders to tourists

When tourism began to rise, most island residents were happy to have the jobs and foreign investment, and their governments did not take the time nor resources to develop a management strategy or implement limitations. Now, many governments are scrambling to preserve the very ecosystems that bring tourists to their shores before they are destroyed beyond repair.

After calling the waters around Borocay Island a “cesspool,” Filipino President Rodrigo Duerte closed the entire island and launched a large clean-up effort. A new management plan will reduce the daily visitors from 20,000 to approximately 6,000, ban single-use plastics, impose littering fines and ban jet skis from driving within 100 meters of the shore. With these steps, an acceptable rehabilitation of the island is expected to take at least two years.

In Thailand, the government closed the famous Maya Bay indefinitely after conservationists reported that over 50 percent of corals had been destroyed. In addition to sunscreen toxins, boat anchors and physical impact from tourists walking on coral and taking pieces as souvenirs cause major damage.

Current coral restoration efforts are underway to replant native corals, and species like black tipped reef sharks have reportedly returned.

SEE: Can the Cayman Islands save to Caribbean’s remaining coral reefs?

Closing islands is an extreme solution, but it demonstrates that many governments are realizing the importance of ecosystems even at the expense of tourism revenue. Sustainable tourism expert Epler Wood said, “We don’t advocate a closing unless it’s an emergency. We recommend balanced management that looks at supply and demand and measured responses based on planning and science that involves regular benchmarking, like water testing.”

Crisp, clear beach with rocks in the Philippines during a colorful sunset

Tips for sustainable tourism

Tips for governments:

The nation of Bali has imposed a $10 tax on international passengers that goes directly toward cultural and environmental preservation initiatives, such as waste management. Many tourism-dependent islands in the Pacific and Caribbean have imposed similar tourist fees.

In Palau, visitors are required to sign an environmental pledge that is stamped right onto their passports, promising to act respectfully and without damaging ecosystems.

Bans on straws and single-use plastics can also be particularly effective on small islands without proper waste management systems.

Finally, governments can invest in marine spatial planning and zoning initiatives that identify key vulnerable areas. Such spatial data allows governments to declare zones and enforce allowable activities within the zones, such as protected conservation areas versus recreation areas.

Tips for tourists:

According to the South China Morning Post, here are five tips to be a more sustainable tourist:

Book hotels that employ sustainable initiatives to reduce waste, energy and water consumption.

Choose tour operators who give back to the community — and keep tourism benefits within the local economy — by employing locals, supporting local growers and other initiatives.

Be a plastic-free traveler and dispose of your garbage correctly.

Research sustainable tourism initiatives you might want to support ahead of your trip.

Engage in community-based tourism.

“The basic model is: educate yourself, do the right thing and try to be of positive benefit,” said Marta Mills, a sustainable tourism specialist. “Act like you are a guest in someone’s home, because you are.”

Via Yale360

Images via Mohd Fazlin Mohd Effendy Ooi, Laznes BinchStefan Munder, Juanjook Torres González and Jose Nicdao