[http://www.sbc.slb.com/Our_Work/Energy_Expertise/CO2_Emissions_Clean_Energy.aspx '''Worldwide Natural gas resources]
[[Image:Worldwide distribution of Natural Gas Resources.jpg|left|thumb|400px600px|[http://www.sbc.slb.com/Our_Work/Energy_Expertise/CO2_Emissions_Clean_Energy.aspx Fig. 4 Worldwide distribution of Natural Gas Resources]]]
[[Image:U.S Natural Gas Production, prediction from 1990 to 2035 year.jpg|centre|thumb|400px|http://www.sbc.slb.com/Our_Work/Energy_Expertise/CO2_Emissions_Clean_Energy.aspx Fig.5 U.S Natural Gas Production, prediction from 1990 to 2035 year]]]