i'm from dahlberg global development advisers. i've heard a lot of emphasis from both of you speakers about the multi-billion dollar commitment that will be required from the public -- from the private sector in order to fund sustainable energy access to all, but there seems to be a difference of emphasis about the funding that will go to research and funding that will go to roll out of these initiatives, so i guess i'd be interested to hear you talk more about what the appropriate ball is for researching new technologies and also expanding the delivery of existing solutions. >> great. and our final question, the gentleman right here. i'm diego, american university student. thank you for taking a second question, and my question is what is the stand of the united states and the global community on biofuels and other alternative energies that are more controversial, with nuclear energy with all the things that have happened recently? what is the role in the rio plus 20 conference? >> great. carlos, in one minute if you could answer