Once considered too expensive, as well as too damaging to the land, exploitation of Alberta's oil sands is now a gamble worth billions.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/scraping-bottom
[2] http://admin.indiaenvironmentportal.org.in/category/author/robert-kunzig
[3] http://admin.indiaenvironmentportal.org.in/category/journal/national-geographic
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/canada
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-sequestration
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/oil-exploration
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/toxic-wastes