joining us for that conversation from washington, vickie arroyo, executive director of the georgetown climate center from georgetown school of law. from francisco, managing director of the analysis group, and also mark mrano, public rights of the website energy depot.com. you heard the administrator extolling the do ability of this grand goal. she called it ambitious but achievable. is it both? >> yes, i have been calling it ambitious, but reasonable today. it really allows so much flexibility for states to figure out where to go. i think of this as a gps system, epa said where are you going, but you can choose your root. it is not anti-coal. it is not anti-fossil fuel. it is anti-carbon emissions, and it really allows a reasonable time frame for the country doing more of what it's been doing for the past few years. it's really doable. >> mark, same question, ambitious and achievable. >> i would say it's ambitious and probably a sad day for american history. here we have a president who--a long history. we signed u.n. treaties but failed to ratify them. we signed the cap and trade in