In "An Inconvenient Truth," the main greenhouse gas is carbon dioxide.
In "An Inconvenient Truth," the main greenhouse gas highlighted is carbon dioxide (CO2). To determine this answer, you can either watch the documentary "An Inconvenient Truth" created by Al Gore, where he emphasizes the role of CO2 as the main greenhouse gas responsible for global warming, or consult other reputable sources that discuss the film or the topic of climate change. Many scientific studies and reports also confirm that carbon dioxide is the primary greenhouse gas contributing to climate change.
