Environmental organizations have generally insisted that ecotourism is nature-based, sustainably managed, conservation supporting, and environmentally educated. The tourist industry and governments, however, focus more on the product aspect, treating ecotourism as equivalent to any sort of tourism based in nature. As a further complication, many terms are used under the rubric of ecotourism. Nature tourism, low impact tourism, green tourism, bio-tourism, ecologically responsible tourism, and others have been used in literature and marketing, although they are not necessarily synonymous with ecotourism.The problems associated with defining ecotourism have often led to confusion among tourists and academics. Many problems are also subject of considerable public controversy and concern because of green washing, a trend towards the commercialization of tourism schemes disguised as sustainable, nature based, and environmentally friendly ecotourism. According to McLaren, these schemes are environmentally destructive, economically exploitative, and culturally insensitive at its worst. They are also morally disconcerting because they mislead tourists and manipulate their concerns for the environment. The development and success of such large scale, energy intensive, and ecologically unsustainable schemes are a testament to the tremendous profits associated with being labeled as ecotourism. Negative impact
Ecotourism has become one of the fastest-growing sectors of the tourism industry. One definition of ecotourism is "the practice of low-impact, educational, ecologically and culturally sensitive travel that benefits local communities and host countries". : 71  Many of the ecotourism projects are not meeting these standards.
A parapharyngeal abscess is a deep neck space abscess of the parapharyngeal space (or pharyngomaxillary space), which is lateral to the superior pharyngeal constrictor muscle and medial to the masseter muscle. This space is divided by the styloid process into anterior and posterior compartments. The posterior compartment contains the carotid artery, internal jugular vein, and many nerves. Signs and symptoms
Symptoms include fever, sore throat, painful swallowing, and swelling in the neck. An anterior space abscess can cause lockjaw (spasm of jaw muscle), and hard mass formation along the angle of the mandible, with medial bulging of the tonsil and lateral pharyngeal wall. A posterior space abscess causes swelling in the posterior pharyngeal wall, and lockjaw is minimal. Other structures within the carotid sheath may be involved, causing rigors, high fever, bacteremia, neurologic deficit, or a massive haemorrhage caused by carotid artery rupture. Cause
Infection can occur from:

Pharynx: acute and chronic infection of tonsil and adenoids
Teeth: dental infection occurs from lower last molar tooth
Ear: Bezolds abscess and petrositis
Other space: infection of parotid retropharyngeal space
External trauma: penetrating injuries of neck, injection of local anaesthetic

Epidemiology
Parapharyngeal abscess is more common in male than the female gender. Any age group can develop a parapharyngeal abscess but it is most commonly seen in children and adolescents. Adults who are immunocompromised are also at high risk. == References ==