Data from the United Nations 'Intergovernmental Panel on Climate Change (IPCC) indicates that the current global rate of atmospheric warming is three times as fast as that seen in previous periods of warming in the Earth's history.
聯合國「跨國氣候變遷小組」的數字也指出，目前全球氣溫上升速率，較之地質史上氣候自然增溫的速率，幾乎快上三倍。