(MENAFN - The Conversation) Travel is a major global industry, but in 2017 it attracted unprecedented resentment and retaliation towards tourists. A growing global backlash against tourism extended from tropical to urban destinations like and .

I have studied tourism's social and environmental consequences along the coastlines of Colombia, Costa Rica and Nicaragua, in the rain forests of Peru and Ecuador, on the islands of Fiji and the Galapagos and across the savannahs of South Africa and Tanzania. My research and that of numerous other scholars spotlights a key fact: More tourism is not always better. Increasing the number of visitors has generated profits for travel companies – particularly the cruise ship industry – but it has not always benefited local communities and environments where tourism occurs.

Fortunately, once people are aware of the often surprising ways in which their trips impact local people and places, it becomes easy to ensure that their travel has more positive consequences for the destinations they visit.

A demonstrator holds a Basque-language banner that reads 'Tourism = a poverty salary' during a protest against massive tourism in San Sebastian, Spain, on Aug. 17, 2017. Billions on the move

Born from the accessibility of mass air travel, modern international tourism has been popularized as in regions that offer comparative advantages of sand, sun and sea. Travel is often portrayed as a tool for and tourism as an for destination countries and cities. There is a tendency to assume that tourism is good for everyone involved.

Today the big bang of tourism drives more than across international borders each year, generates 9 percent of global GDP and provides one out of every 11 jobs on earth. But many popular places are literally being . Recent protests in ports of call like against disturbances created by larger and more numerous cruise ships show the unfortunate consequences of emphasizing .

Unabated tourism development has become a primary driver of social and environmental disruption. Tourism studies, which , provides much documentation of the many and resulting resentment that local populations direct towards visitors.

Early tourism scholars even developed an 'irridex' to measure this . Later, scholars identified stages through which tourist destinations evolve. Antagonism toward tourists typically develops in . Protests in heavily visited destinations suggest that traditional tourism has overstayed its welcome.

, and were regularly documented in the 1970s and '80s, at a time when only 2 to 3 million tourists were crossing international borders annually. So it is not surprising that such protests have escalated in scale and frequency as tourism has grown.

In Barcelona, for example, growing resentment of neighborhood gentrification, elevated real estate and rental prices, and erosion of local social networks has led some residents to call tourism the city's biggest problem and .'

Nations compete for market share at the 2015 New York Times Travel show. Friends without benefits

Residents often become frustrated when the benefits of tourism are not felt locally. Although it can generate foreign exchange, income and employment, there is no guarantee that multinational hotel chains will allocate these benefits equitably among local communities.

On the contrary, when people stay at large resorts or on cruise ships, they make most of their purchases there, leaving local communities little opportunity to benefit from tourist spending. These forms of tourism between haves and have-nots at local destinations.

In recent decades, local residents in destination communities also have found themselves negotiating . For example, data show that tourism activity corresponds to increased as local residents adopt the behaviors of tourists, often leading to parallel upticks in , and .

All-inclusive resorts can also to important coastal, marine, forest and agricultural resources. And when foreign investment drives up local land values and living costs to international standards, it may put ownership out of reach for local residents. In such situations, even people who depend on tourism will often question its ethics, whether they are rural Nicaraguan residents working in a or urban dwellers being priced out of their apartments by .

All-inclusive resorts (shown: Hotel Majestic Colonial Punta Cana, Dominican Republic) offer amenities such as shopping, child care, religious services and multiple bars and restaurants, reducing incentives to spend time outside the gates. , Cruise lines miss the boat

Jim Damalas, owner of in Costa Rica, observes that publicly traded corporations do 'not fall in love with the country, they fall in love with the numbers.' No form of tourism is more in love with the numbers than cruises. While all forms of tourism have grown in recent decades, the rise in cruise travel is dramatic. For instance, cruise visitors to Belize grew from .

Contemporary cruise ships can entertain as many as . These boats themselves are the destinations. As they bounce from port to port, they are not beholden to any particular community and provide only the most superficial levels of engagement with local people and places. Their business model emphasizes packing into the greatest number of places in the shortest amount of time.

Research into the industry's impact has shown that few forms of tourism do less to improve the , or of the places where they occur than cruises. These trips may give passengers a pleasurable experience, but they miss the boat – pun intended – with regard to supporting local communities and environments.

Royal Caribbean's Oasis-class cruise ships can carry more then 5,400 passengers and displace roughly as much water as a Nimitz-class aircraft carrier. , A better model

The United Nations declared 2017 the . What does this mean for the everyday traveler? Here are a few of the U.N.'s suggestions, which research on tourism supports.

First, as Stephen Colbert has , 'There's nothing American tourists like more than the things they can get at home.' All tourists should make every effort to honor their hosts and respect local conditions. This means being prepared to adapt to local customs and norms, rather than expecting local conditions to adapt to travelers.

Second, tourism is a market-based activity and works best when consumers reward better performers. Livelihoods, human rights and the fate of endangered species all can be affected by travelers' decisions. In the information age, there is little excuse for travelers being uninformed about where their vacation money goes and who it enriches.

Informed travelers also are better able to distinguish between multinational companies and local entrepreneurs whose businesses provide direct social, environmental, and economic benefits for local residents. Such businesses are in love with the destination, not just the numbers, and are therefore deserving of market reward.

In the long run, the goal should not be just to minimize the impact of travel. Being means ensuring net positive impacts for local people and environments. With the amount of information available at our fingertips, there has never been more opportunity to do so.

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