Greenhouse -

: The United Nations identifies several critical impacts:

) : The most abundant natural GHG, acting as a "feedback" that amplifies warming [1, 5, 20]. Carbon Dioxide ( CO2cap C cap O sub 2 greenhouse

) : The primary driver of recent human-caused warming, largely from burning fossil fuels [3, 25, 33]. : Significantly more potent at trapping heat than CO2cap C cap O sub 2 : The United Nations identifies several critical impacts: