Review: 'Big Men' hits a gusher of oil and greed

Rachel Boynton's compelling documentary follows what happens when Texas oil exploration firm Kosmos Energy makes an enormous discovery called the Jubilee Field off the coast of Ghana.No single resource is more essential to modern life than oil, and no film offers a more incisive look at how the enormous wealth oil creates subverts the morality of individuals, corporations, even entire countries than Rachel Boynton's compelling documentary "Big Men."