Still, no new coal through 2020 (when that particular model ends its analysis).

FORBES: President Obama's Alleged "War On Coal" - Climate Change Edition

Its latest analysis examined the business model (Paid, Paid with In-App Purchases and Freemium) and revenues per download in the Apple App Store from January 2012 through March 20, 2013.

FORBES: Apps With In-App Purchase Generate the Highest Revenue