Next week on The Exchange, we begin with more “fuel for debate” over Wood energy, as new research casts doubt how “green” it really is. Then historian and author Nathanial Philbrick on his new book “Bunker Hill”, the untold story of the battle he calls “the great tipping point” of the American Revolution. Later, our Sky Guys with an update from the “way beyond” including the coming of “the comet of the century” this fall. Email us at NHPR dot org and join us all next week for The Exchange every morning live at 9 and again at 8 p m...here on NHPR!