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Late 18th Century - The massive burning of coal leads to increased CO2 emissions, marking the beginning of significant human impact on Earth's climate.

1824 - Joseph Fourier proposes that Earth's atmosphere retains heat, suggesting a natural 'greenhouse effect.'

1859 - John Tyndall discovered that gases like CO2 and water vapor trap heat, furthering the understanding of the greenhouse effect.

1896 - Arrhenius publishes the first calculation of global temperature increase from human CO2 emissions, predicting that doubling atmospheric CO2 would lead to significant warming.

1958 - Charles Keeling starts recording atmospheric CO2 at the Mauna Loa Observatory, providing the first clear evidence of rapidly increasing carbon dioxide levels.

1970 - Earth Day is established, raising awareness of environmental issues including pollution and conservation, but also the climate change problem.

1979 - The 'Charney Report' quantifies expected climate change, estimating that a doubling of CO2 levels would likely lead to a 3°C increase in global temperatures.

1988 - The Intergovernmental Panel on Climate Change (IPCC) is established to assess scientific information related to climate change.

1990 - The first IPCC Assessment Report provides a comprehensive scientific view of climate change and its potential environmental and socio-economic impacts.

1992 - The UNFCCC is established to framework international cooperation to combat climate change by reducing greenhouse gas concentrations in the atmosphere.

1997 - Kyoto Protocol, an international treaty, commits its parties to reduce greenhouse gas emissions, based on the principles of the UNFCCC.

2001 - The IPCC's third report states that most of the warming observed over the last 50 years is attributable to human activities.

2006 - The Stern Review on the Economics of Climate Change discusses the effect of global warming on the world economy.

2007 - The IPCC states that warming of the climate system is unequivocal and that most of the observed increase is very likely due to the observed increase in anthropogenic greenhouse gas concentrations.

2015 - An agreement within the UNFCCC dealing with greenhouse gas emissions mitigation, adaptation, and finance, signed by 196 parties.

2015 - The United Nations adopts 17 SDGs to protect the planet and ensure prosperity for all, with Goal 13 specifically targeting climate action.

2018 - The IPCC released a special report on the impacts of global warming of 1.5 °C above pre-industrial levels, urging for unprecedented changes to avoid severe climate implications.

2021 - The United States, after exiting under the Trump administration, officially rejoins the Paris Agreement under President Joe Biden.

2021 - COP26 includes negotiations on updating and implementing commitments to the Paris Agreement, with a focus on keeping the 1.5°C target within reach.