Responsible travel is not as recent a concept as some might think. Eco-tourism first emerged in the 1970s in response to such developments as the destruction of the Amazon rainforest and poaching in Africa. From those origins of low impact, conservation-driven responsible holidaymaking, a sizeable industry has been generated that touches every type of traveller.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/industry-keen-assert-its-green-credentials
[2] http://admin.indiaenvironmentportal.org.in/category/author/roger-blitz
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/financial-times-london
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ecotourism
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/amazon
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tropical-forests
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-transport
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/poaching
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa