Webster’s Dictionary defines hypocrisy as “the practice of claiming to have moral standards or beliefs to which one’s own behavior does not conform.”
When Cook says, "We are the energy hogs,” she means that we use energy in a selfish and immoral way, namely by using it so excessively that we damage our environment. When Cook says, “we are the problem,” she attributes this damage to the fact that we insist on benefiting needlessly from oil in the short term at the expense of damaging the environment in the end. For example, using oil as a source of energy — which we do when we use gas-powered cars as a source of transportation — benefits us in the short term in so much as it fuels our transportation, but it harms the environment in the end. When Cook says, “we are the solution,” she means that we can and should curtail, as much as possible, our practice of benefiting from oil when doing so harms the environment, which means we should avoid benefiting from oil needlessly.