താഴെപറയുന്നവയിൽ ആഗോളതാപനത്തിന് കാരണമാകുന്ന മുഖ്യവാതകം ഏത്?
Aഹൈഡ്രജൻ
Bനൈട്രജൻ
Cകാർബൺ ഡൈ ഓക്സൈഡ്
Dഓക്സിജൻ
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