I know that.
On April 21st, 2009. See this statement in context.
On April 21st, 2009. See this statement in context.
April 21st, 2009 / 4:50 p.m.
Associate Director, Energy Efficiency Center at University of California, Davis, and Senior Scientist, Lawrence Berkeley National Laboratory, As an Individual
I know that.
See context to find out what was said next.