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\newpage  \section{DF11}  \section*{Alternatives to Fossil Fuels}  \subsection{Biofuels}  \begin{itemize}  \item Derived from renewable materials  \item Eg. Ethanol and Biodiesel  \end{itemize}  \subsubsection{Ethanol}  \begin{itemize}  \item From fermentation of crops  \item Grown as a cash crop  \item Too volatile to use pure ethanol  \item Up to 15\% used in a mixture  \end{itemize}  \subsubsection{Biodiesel}  \begin{itemize}  \item From trans-esterification of oils or fats  \item Made from waste oil  \item Used pure or as a mixture  \item Biodegradable  \item Less pollutants released  \begin{itemize}  \item Apart from Nitrogen Oxides  \end{itemize}  \end{itemize}  \subsection{Hydrogen}  \begin{equation*}  2H_2+O_2\Rightarrow 2H_2O  \end{equation*}  \begin{itemize}  \item Renewable  \item Transportable by pipeline  \item Used directly in engine or as a fuel cell  \item No poluutants  \item From electrolysis  \begin{itemize}  \item Uses alot of electricity  \end{itemize}  \item Low energy density in comparison to other fuels  \end{itemize}