This document provides a history of the development of environmental laws from the 19th century to present day. It discusses key events and agreements including the Stockholm Declaration (1972), Rio Earth Summit (1992), Kyoto Protocol (1997), Millennium Development Goals (2000), Rio+20 Conference (2012), Paris Climate Agreement (2015), and COP24 in Poland (2018). It highlights influential people like Severn Cullis-Suzuki and Greta Thunberg and their calls to action. International agreements like the UNFCCC, CBD, and UNCCD are also examined, in addition to how they are applied in Bangladesh through ratification of treaties.