Klein made the prize's long list for "This Changes Everything: Capitalism vs the Climate" (Knopf Canada), which is also a finalist for the $25,000 Shaughnessy Cohen Prize for Political Writing.
Levant, winner of the 2011 National Business Book Award, made the cut this time for "Groundswell: The Case for Fracking" (Signal).
Other finalists include Peter Foster for "Why We Bite the Invisible Hand: The Psychology of Anti-Capitalism" (Pleasaunce Press) and Alfred Hermida for "Tell Everyone" (Doubleday Canada).
The long list is rounded out by Gordon Pitts for "Fire in the Belly: How Purdy Crawford Rescued Canada and Changed the Way We do Business" (Nimbus Publishing); Jacques Poitras for "Irving vs. Irving" (Viking Canada); and Clive Veroni for "Spin: How Politics has the Power to Turn Marketing on its Head" (House of Anansi Press).
The winner will be announced on April 16.
This year's jury is chaired by CBC anchor Peter Mansbridge and also includes William Dimma, Deirdre McMurdy, David Denison, Anna Porter and Pamela Wallin.