This process does not lead to an economic explosion not only because of the supply-side barriers at potential output (full employment) but because at each "round", the increase in consumer spending is less than the increase in consumer incomes. That is, the marginal propensity to consume (MPC) is less than one, so that each round some extra income goes into saving, leaking out of the cumulative process. Each increase in spending is thus smaller than that of the previous round, preventing an explosion. Efforts to preserve ecosystems at risk
Some of the worlds most exceptional biodiversity is located in the Galapagos Islands. These islands were designated a UNESCO World Heritage site in 1979, then added to UNESCOs List of World Heritage in Danger in 2007. IGTOA is a non-profit dedicated to preserving this unique living laboratory against the challenges of invasive species, human impact, and tourism. For travelers who want to be mindful of the environment and the impact of tourism, it is recommended to utilize an operator that is endorsed by a reputable ecotourism organization. In the case of the Galapagos, IGTOA has a list of the worlds premiere Galapagos Islands tour companies dedicated to the lasting protection and preservation of the destination. Natural resource management
Natural resource management can be utilized as a specialized tool for the development of ecotourism. There are several places throughout the world where a number of natural resources are abundant, but with human encroachment and habitats, these resources are depleting.
While some ecotourism projects, including some found in the United States, can support such claims, many projects have failed to address some of the fundamental issues that nations face in the first place. Consequently, ecotourism may not generate the very benefits it is intended to provide to these regions and their people, and in some cases leaving economies in a state worse than before.The following case studies illustrate the rising complexity of ecotourism and its impacts, both positive and negative, on the environment and economies of various regions in the world. Ecotourism in Costa Rica
Ecotourism in Jordan
Ecotourism in South Africa
Ecotourism in the United States

See also
References
Further reading
Burger, Joanna (2000). "Landscapes, tourism, and conservation". Science of the Total Environment. 249 (1–3): 39–49. Bibcode:2000ScTEn.249...39B. doi:10.1016/s0048-9697(99)00509-4. PMID 10813445. Ceballos-Lascurain, H. 1996. Tourism, Ecotourism, and Protected Areas. Larkin, T. and K. N. Kähler. 2011. "Ecotourism." Encyclopedia of Environmental Issues. Rev. ed. Pasadena: Salem Press. Vol. 2, pp. 421–424. ISBN 978-1-58765-737-5
IUCN. The International Union for the Conservation of Nature. 301 pp. Ceballos-Lascurain, H. 1998. Ecoturismo. Naturaleza y Desarrollo Sostenible. Duffy, Rosaleen (2000). "Shadow players: Ecotourism development, corruption and state politics in Belize". Third World Quarterly. 21 (3): 549–565. doi:10.1080/713701038. S2CID 153634543. Gutzwiller, Kevin J.; Anderson, Stanley H. (1999). "Spatial Extent of Human-Intrusion Effects on Subalpine Bird Distributions". The Condor. 101 (2): 378–389. doi:10.2307/1370001. JSTOR 1370001. Orams, Mark B.; Nowaczek, Agnes M.K. (2010). "Ecotourism: Principles and Practices". Annals of Tourism Research. 37: 270–271. doi:10.1016/j.annals.2009.10.007. Orams, Mark B. (2000). "Tourists getting close to whales, is it what whale-watching is all about?". Tourism Management.