A wide consensus exists in the global community regarding the need for a transition to "greener", carbon-neutral, and energy efficient communities. Through the Conference of the Parties (COP) commitments have been made for the mobilization of finance for investment in mitigation, adaptation and other environmental investments. In practice, there is rather large investment gap between the allocated funds and the actual needs for a reaching the set targets. In this study, we will explore the current landscape of "Green Finance", which is finance directed to environmentally friendly projects, how the latest developments in the field like Financial Technology (fintech) could stimulate and drive demand, the available tools for investors, as well as barriers and relevant proposals for unlocking the true potential of green finance. In addition, we will explore in depth one of the most prominent green finance tools available, namely the green bonds. The green bond market's growth has been constant during the last years, but there are still various considerations and barriers that need to be addressed in order to achieve a clear, robust, global green bond market.