road. where are you on this? >> i think the president has been clear that the natural gas boom has provided us an opportunity -- tremendous -- >> you think it's a net positive? >> from a greenhouse gas perspective, it certainly is. and what we can do and what the president has pledged to do in his plan is to continue to look at this and make sure it's safer and cleaner moving forward. we are looking at carbon pollution reductions from the full range of fuels available to us. so it's not just about fossil fuels and natural gas or coal. it's about increasing the supply of renewable energy. that is an area where this administration has had tremendous success. >> as you implement this new rule -- first of all, the new rule on coal, is that a done deal, cutting it in half? >> no, the -- >> give me the sort of the time line -- >> the requirements you mentioned are requirements we proposed. >> who proposed them? >> epa. >> so you proposed them -- >> under the existing -- >> explain this process. is there a comment period? how does it work? >> it's a rulemaking move.