| 1963 | Tree Planting Campaign launched | | |
| 1967-68 | Clean and Green Singapore launched | | |
| 1967.05.11 | Garden City Campaign launched | | |
| 1967.05 | | Parks and Trees Division established | |
| 1968.10.01 | Keep Singapore Clean launched | | |
| 1969.01.02 | | | Environmental Public Health Act enacted |
| 1970 | | Garden City Action Committee established | |
| 1970 | | Anti-Pollution Unit established | |
| 1971.11.07 | Annual Tree Planting Day enacted | | |
| 1972 | | Ministry of Environment established | |
| 1975 | | Parks and Recreation Department established | |
| 1975 | | | Parks and Trees Act enacted |
| 1977.01 | Masterplan for clean up of Singapore River and Kallang Basin announced | | |
| 1986 | | Ministry of Environment and Anti-Pollution Unit merged | |
| 1987.09.02 | Public Opening of Clean Singapore River and Kallang basin | | |
| 1989 | | Waterbodies Design Panel established | |
| 1990 | | National Parks Board established | |
| 1990 | Initial designation of Nature Reserves: Bukit Timah and Central Catchment | | |
| 1990 | | | National Parks Act enacted |
| 1990.11.04 | Clean and Green Week launched | | |
| 1991.08.02 | Initial designation of Tree Conservation Area: MatRichie and Changi | | |
| 1992 | Initial designation of Park connector: Kallang Park Connector | | |
| 1992 | Singapore Green Plan announced | | |
| 1996.07.01 | | National Parks Board and Parks and Recreation Department merged | |
| 1996.07.01 | | | National Parks Act revised |
| 2001 | | PUB designated as the water bureau | |
| 2001 | ABC Waters Programme launched | | |
| 2001.08.17 | Heritage Road Scheme announced | | |
| 2001.08.17 | Heritage Tree Scheme announced | | |
| 2002 | Singapore Green Plan 2012 announced | | |
| 2002.07 | | National Environment Agency (NEA) established | |
| 2004.09.01 | | Ministry of Environment renamed into Ministry of the Environment and Water Resources | |
| 2005 | | | Parks and Trees Act revised |
| 2005 | Revised Singapore Green Plan 2012 announced | | |
| 2008.06 | | Centre for Livable Cities established | |
| 2009 | Sustainable Singapore Blueprint announced | | |
| 2009 | Skyrise Greenery Incentive Scheme announced | | |
| 2009.10.28 | | Singapore Green Building Council(SGBC) established | |
| 2011.01 | SGBC Green Mark Certification launched | | |
| 2013 | Nature Ways established | | |
| 2014.11.08 | Sustainable Singapore Blueprint 2015 announced | | |
| 2016 | | Friends of the Parks established | |
| 2017 | Initial designation of Nature Park Network: Central Nature Park Network | | |
| 2020.07 | | Ministry of Environment and Water Resources renamed into Ministry of Sustainability and the Environment | |
| 2020 | Initial designation of Nature Corridor: Lornie Nature Corridor | | |
| 2021.02 | Singapore Green Plan 2030 announced | | |
| 2021.02 | Ecological Profiling Exercise launched | | |