National Public Radio: An organization headed by former Vice President Al Gore released a television ad Thursday that takes on so-called clean coal technology — a subject that came up in this year’s presidential debates. Although the election is over, the back-and-forth continues over the technology — and even the definition of the term “clean coal.” The idea behind the new commercial from the Alliance for Climate Protection is that clean coal is like the emperor’s clothes: It doesn’t exist. Gore — the …