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1975 - Human population reaches four billion.
1975 - US scientist Wallace Broecker puts the term global warming into the public domain in the title of a scientific paper.
1987 - Human population reaches five billion.
1988 - Intergovernmental Panel on Climate Change (IPCC) formed to collate and assess evidence on climate change.
2013 - The Mauna Loa Observatory on Hawaii reports that the daily mean concentration of CO2 in the atmosphere has surpassed 400 parts per million (ppm) for the first time since measurements began in 1958.
February 2016 was the first month in history that global average temperatures passed the 1.5 degree Celsius mark. Also, since last month’s warmth was concentrated in the Northern Hemisphere (2.76 degrees Celsius warmer than the 1951-1980 baseline) and the Arctic (5.36 degrees Celsius warmer than the 1951-1980 baseline), these regions of our planet were also record warm, likely the warmest they’ve been for at least thousands of years.
1989 - Carbon emissions from fossil fuel burning and industry reach six billion tonnes per year.
1992 - At the Earth Summit in Rio de Janeiro, governments agree the United Framework Convention on Climate Change. Its key objective stabilization of greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic interference with the climate system". Developed countries agree to return their emissions to 1990 levels.
1999 - Human population reaches six billion.
2001 - President George W Bush removes the US from the Kyoto process.
2001 - IPCC Third Assessment Report finds "new and stronger evidence" that humanity's emissions of greenhouse gases are the main cause of the warming seen in the second half of the 20th Century.
People started talking about global warming in about 19 century
1900 - A Swede, Knut Angstrom, discovers that even at the small concentrations found in the atmosphere, CO2 strongly absorbs parts of the infrared spectrum. Although he does not realise the meaning, Angstrom has shown that a trace gas can produce greenhouse warming.
1930 - Human population reaches two billion.
1960 - Human population reaches three billion.
2006 - The Stern Review concludes that climate change could damage global GDP by up to 20% if left unchecked - but curbing it would cost about 1% of global GDP.
2006 - Carbon emissions from fossil fuel burning and industry reach eight billion tonnes per year.
2007 - The IPCC's Fourth Assessment Report concludes it is more than 90% likely that humanity's emissions of greenhouse gases are responsible for modern-day climate change.
2011 - A new analysis of the Earth's temperature record by scientists concerned over the "ClimateGate" allegations proves the planet's land surface really has warmed over the last century.
2011 - Human population reaches seven billion.
2012 - Arctic sea ice reaches a minimum extent of 3.41 million sq km (1.32 million sq mi), a record for the lowest summer cover since satellite measurements began in 1979.