Final answer:
Carbon dioxide (CO2) is the greenhouse gas responsible for around 60% of global warming, largely due to its abundance and longevity in the atmosphere.
Step-by-step explanation:
The greenhouse gas responsible for the majority of global warming is carbon dioxide (CO2). This is due to its capacity to absorb and emit infrared radiation, contributing to the greenhouse effect. While other gases like methane (CH4) and hydrofluorocarbons (HFCs) are more potent on a molecule-for-molecule basis, CO2 is significantly more abundant and persists longer in the atmosphere. These attributes make it responsible for approximately 60% of global warming. Also, carbon dioxide concentrations have increased substantially since the Industrial Revolution, primarily due to the burning of fossil fuels and deforestation, further enhancing its impact on the climate.