Can Science Prove Consciousness Comes from the Brain?

Can Science Prove Consciousness Comes from the Brain?
Intelligence Squared U.S. Debates - Kaufman Center
If consciousness is just the workings of neurons and synapses, how do we explain the phenomenon of near-death experience? By some accounts, about 3% of the U.S. population has had one: an out-of-body experience often characterized by remarkable visions and feelings of peace and joy, all while the physical body is close to death. To skeptics, there are more plausible, natural explanations, like oxygen deprivation. Is the prospect of an existence after death "real" and provable by science, or a construct of wishful thinking about our own mortality?