Some scientists say probably not, pointing out that the increase in temperature falls within the range of natural variation and that the sun may be responsible. However, many climate experts agree with the wording of a report by the Intergovernmental Panel on Climate Change.
पहली, हाल के दशकों और सदियों के दौरान वायुमंडल में कार्बन डाइऑक्साइड और अन्य ग्रीनहाउस गैसों की मात्रा बढ़ी है ।