Context: United Nations' Secretary-General Ban Ki-moon has said that "renewable energy has the ability to lift the poorest nations to new levels of prosperity". In October 2011, he "announced the creation of a high-level group to drum up support for energy access, energy efficiency and greater use of renewable energy. The group is to be co-chaired by Kandeh Yumkella, the chair of UN Energy and director general of the UN Industrial Development Organisation, and Charles Holliday, chairman of Bank of America".

Question: Who is United Nations' Secretary-General?
Answer: Ban Ki-moon

Question: Ban Ki-moon states that renewable energy has the ability to lift the poorest nations to new levels of prosperity?
Answer: renewable energy

Question: Who is chair of UN Energy?
Answer: Kandeh Yumkella

Question: Who is chairman of Bank of America?
Answer: Charles Holliday

Question: Who is UK's Secretary-General?
Answer: Unanswerable

Question: Who is US's Secretary-General?
Answer: Unanswerable

Question:  Ban Ki-moon states that renewable energy has the ability to lift the richest nations to new levels of prosperity?
Answer: Unanswerable

Question:  Who is chair of US Energy?
Answer: Unanswerable

Question:  Who is chairman of Bank of Canada?
Answer: Unanswerable