\documentclass{beamer}

\usepackage{bookmark}

\usetheme{Darmstadt}

\title{Outside the Box Portfolio}
\author{Arnaud BASTIAN}
\date{}

\begin{document}
\maketitle

\begin{frame}{The great challenges of the $21^{st}$ century}
    



Through the portfolio, I will unfold the great challenges of the $21^{st}$ century,
all related to climate change considerations and the modern society. I will develop various related subjects, such as energy and transport.

\end{frame}

\begin{frame}
    \tableofcontents
\end{frame}

\include{energy}

\include{nuke}

\include{passports}

\include{conclusion}
\end{document}