On a GLOBAL WARNING? the History Channel presents a typically thorough overview of the potentially catastrophic problems caused by global warming. The filmmakers take a look at the origins of global warming by examining when climate change may have begun. They also examine some turbulent periods in the planet's history, where nature wreaked havoc on the planet. Some fascinating facts are revealed, and the program clearly demonstrates that global warming may have threatened the Earth for quite some time. Special Features: Full Frame - 1.33 Additional Release Material: Additional Scenes Runtime: 94 minutes Year of Release: 2007.