By Raj Pai and Andrew Pruett The future of renwable energy in the US will require multiple innovative solutions if we are serious about decreasing our dependence on fossil fuels. The depletion of global petroleum reserves, control of the reserves by countries hostile to US interests, and global warming has precipitated a surge in the public’s enthusiasm to replace petroleum as a source for fuel and chemicals. As a leader in innovation, Minnesota could become a literal ‘power house’ fo