Actually, it has more to do with engineering. I do not really know what it would take specifically to make our refineries more environmentally efficient. I believe that we should certainly apply the best regulations in the world. Furthermore, if we import products from countries with less stringent regulations or if we export our oil to those countries, we contribute to environmental pollution at the global level. However, I cannot specifically answer your question on which measures should be taken.
On February 2nd, 2012. See this statement in context.