To help choose an environmentally conscious vacation resort destination, it is first important to define what we mean by "ecotourism". Ecotourism essentially means ecological tourism, where ecological has both environmental and social connotations. It is defined both as a concept-tourism movement and as a tourism (specifically sustainable tourism) sector. Born in its current form in the late 1980s, Ecotourism came of age in 2002, when the United Nations celebrated the "International Year of Ecotourism". The International Ecotourism Society defines ecotourism as "responsible travel to natural areas that conserves the environment and improves the well-being of local people". However, this is a vibrant, new movement and there are various definitions.

Eco-tourism focuses on local cultures, wilderness adventures, volunteering, personal growth and learning new ways to live on our vulnerable planet. It is typically defined as travel to destinations where the flora, fauna, and cultural heritage are the primary attractions. Responsible ecotourism includes programs that minimize the adverse effects of traditional tourism on the natural environment, and enhance the cultural integrity of local people. Therefore, in addition to evaluating environmental and cultural factors, initiatives by hospitality providers to promote recycling, energy efficiency, water re-use, and the creation of economic opportunities for local communities are an integral part of ecotourism.

Many global environmental organizations and aid agencies favour ecotourism as a vehicle to sustainable development.

When choosing an eco-friendly vacation or resort, here are some criteria which you should take into consideration;

For many countries, ecotourism is not so much seen as a marginal activity intended to finance protection of the environment than as a major sector of national economy and as a means of attracting tourists. For example, in countries such as Kenya, Ecuador, Nepal, Costa Rica and Madagascar, ecotourism represents a significant portion of the gross domestic product.

The concept of ecotourism is widely misunderstood and, in practice, is often simply used as a marketing tool to promote tourism that is related to nature. Critics claim that ecotourism as practiced and abused often consists in placing a hotel in a splendid landscape, to the detriment of the ecosystem. According to them, ecotourism must above all sensitize people with the beauty and the fragility of nature. They condemn some operators as "green-washing" their operations — that is, using the label of "ecotourism" and "green-friendly", while behaving in environmentally irresponsible ways.

Although academics argue about who can be classified as an ecotourist, and there is precious little statistical data, some estimate that more than five million ecotourists — the majority of the worldwide population — come from the United States, with other ecotourists coming from Europe, Canada and Australia.

Currently there are various moves to create national and international ecotourism certification programs, although the process is causing controversy.

One criticism against ecotourism is that the air travel to often remote places is not included in the "environmental impact calculation". A journey to a place 10,000 km away and home consumes about 700 litres of fuel per person. Another problem is that some of the destinations visited by ecotourists are extremely sensitive to environmental impact from human use (e.g. Antarctica, bird breeding colonies) and can be damaged even by careful travellers.