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\subsection{O2}  \begin{itemize}  \item The mixture of gases surrounding the Earth is the atmosphere  \item Balance of radiation is crucial in determining global temperature  \begin{itemize}  \item Amount and type that reaches atmosphere  \item Amount absorbed by Earth  \item Amount reradiated into atmosphere  \item Amound reabsorbed by atmosphere  \item Amount escaping to space  \end{itemize}  \item Human influences alter composition, leading to global warming  \end{itemize}  \\  \begin{itemize}  \item Oceans absorb carbon dioxide, preventing build up in atmosphere  \item Phytoplankton use CO\textsubscript{2} removing it from atmosphere  \end{itemize}  \begin{gather*}  CO_{2(g)}+aq\rightleftharpoons CO_{2(aq)}\\  CO_{2(aq)}+H_2O\rightleftharpoons H^++HCO_3^-\\  HCO_3^-\rightleftharpoons H^++CO_3^{2-}  \end{gather*}  \begin{itemize}  \item Reactions with water removing carbon dioxide from equilibrium, allowing more to dissolve  \item Most soluble in cold deep ocean  \end{itemize}