 How has shale gas changed the energy portfolio in the U.S. and how does that impact energy security? We've seen significant changes in the volumes of fuels now, energy in a broader sort of way. They're coming out of Pennsylvania with the advent of shale energy development and also other types of energy. And there's a real relationship between the two, so as we see more shale development as it's going forward and large volumes of gas that are being produced in Pennsylvania, it's offsetting the need for other types of fuel sources or other types of energy production that might have been there in the past, namely coal. But we're also then seeing the implications to other industries like nuclear or potentially renewables and others, you know, even the potential to develop other industries, energy related industries over time. So there's a significant impact coming from energy development as it's occurring with shale, shale oil and gas, gas when you think about Pennsylvania, but oil when you think about other aspects of the U.S. more broadly or globally. One of the places that we certainly see major implications is in the power generation side. So we see less nuclear potentially, which could be problematic when we think about carbon. But we also are seeing a greater pairing of renewables. And so as we see more renewables come forward, there's demand then to be able to backfill when renewables are producing. So that's a place that often is considered for natural gas and larger and larger amounts of natural gas are coming from shale. So again, there's opportunities that we'll likely see going forward, but there's other issues related to that that we need to keep in consideration with these other types of fuels that we've been using over the course of time. Now the implications of that to the U.S., as just stated, also have impact on the global nature. So as more power, for instance, is being generated from some of these gas supplies, then that potentially is less gas to be shipped. Or that's power that we might be distributing in different ways across border to Mexico and to Canada. So either power going across some wires or gas going across back and forth in pipes.