Post Carbon Fellow Richard Heinberg was interviewed for Straight Talk.

From the article:

Now, Heinberg revealed, his next “big project” is called “Our Renewable Future”, an analysis of various energy uses and an attempt to determine how each one can theoretically be replaced with a renewable source of fuel. Heinberg said he expects the results out in September or October.

“There are a lot of challenges with switching to renewables for all energy consumption,” Heinberg said in a wide-ranging telephone interview.