The Republicans say he is blocking the exploitation of the country's energy resources, so he promised more exploitation of offshore oil and gas and called for new tax credits for clean energy.

ECONOMIST: Lexington

The latest memorandum of understanding, signed by Tehran and CNOOC, China's biggest offshore oil producer, would involve the exploitation of the North Pars fields and the construction of Iranian liquefied natural gas facilities, whose products would then be exported to China.

CENTERFORSECURITYPOLICY: Securing America's energy needs

Other innovations, such as producing liquefied natural gas from offshore sources and shipping it to its destinations directly, and technologies that might allow exploitation of the natural gas that is frozen into some permafrosts, further increase the scope for new production.

ECONOMIST: Unconventional gas