Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 25 to 29.

Around 200 million people are employed in tourism worldwide, making it the largest industry in the modern global (25)________ . It is estimated that three-quarters of a billion people go on holiday each year, and industry planners expect this figure to double by 2020. Some of the biggest beneficiaries are less developed countries, where it is often their main source of income.

(26)________, along with the economic benefits, this mass movement of people has resulted in threats to the environment. People often forget the damage caused by carbon dioxide emissions from aircraft, (27)________ contribute directly to global warming. Deforestation has cleared land in order to build hotels, airport and roads, and this has destroyed wildlife. In some areas, water shortages are now common because of the need to fill swimming pools and water golf courses for tourists. By pushing up prices for goods and services, tourism can also be (28)________ to the people who live in tourist destinations.

In response to these concerns, some travel operators now offer environmental friendly holidays. Many of these aim to reduce the negative effect of tourism by (29)________ only hotels that have invested equipment to recycle waste and use energy and water efficiently. Increasingly, tourists are also being reminded to show respect for the customs of the people whose countries they are going to visit, and to support local businesses, such as restaurants and shops, which depend on tourism for their main income

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