Coal is our cheapest and most abundant source of fossil-fuel energy. We probably have enough to keep the world powered for hundreds of years.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/can-coal-live-its-clean-promise
[2] http://admin.indiaenvironmentportal.org.in/category/author/fred-pearce
[3] http://admin.indiaenvironmentportal.org.in/category/journal/new-scientist
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-impacts
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coal
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-sinks
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-sequestration
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fossil-fuels
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/research
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe