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At the end of the century XIX scientists observed anomalies that could not be attributed to "nature".
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In 1712 the first steam engine was invented by the british hardware dealer Thomas Newcomen.
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In 1800 the world population reaches one billion.
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In 1824 the concept of "greenhouse effect" is first described and used by the French physicist Joseph Fourier.
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In 1861 it is demonstrated by the Irish physicist John Tyndall that CO2 and H2O cause changes in the climate.
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In 1895 it is concluded by the Swedish chemist Svante Arrhenius that the combustion of carbon will increase the greenhouse effect.
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In 1930 the human population reaches two billion.
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In 1938 it was demonstrated by the British engineer Guy Callendar that the temperature has increased during the last 100 years as a result of the increase in CO2 concentrations. The so-called "Callendar effect" is widely dismissed.
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In 1958 he was hired to continuously monitor CO2 levels in the atmosphere. Geochemist Charles David Keeling; in just two years there is an increase in Antarctic.
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In 1960 the human population reaches three billion.
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In 1965 the Advisory Committee panel of a US president warns that the greenhouse effect is a matter of "real concern".
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In 1972, the First United Nations (UN) Conference on the Environment was given, the Stockholm Declaration. Climate change was hardly registered in the program, which focused on topics such as chemical contamination, the test of the atomic bomb and Whale hunting. The United Nations Program (UNEP) is formed as a result.
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In 1975 the human population reaches four billion.
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In 1975 the term "global warming" was put by the American scientist Wallace Broecke in the public domain in the title of a scientific article.
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In 1987 the human population reaches five billion.
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In 1987 in the Montreal Protocol it was agreed, the restriction of chemicals that damage the ozone layer. Although not established with climate change in mind, this agreement had a greater impact than on greenhouse gas emissions than the Kyoto Protocol.
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In 1988 they create the Intergovernmental Group of Experts on Climate Change (IPCC) by The World Meteorological Organization (OMM) and the United Nations Environment Program (UNEP)
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In 1989, UK Prime Minister Margaret Thatcher warned in a speech to the UN that "we are seeing a huge increase in the amount of carbon dioxide reaching the atmosphere and calling for a global treaty on climate change."
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in 1989 Carbon emissions from burning fossil fuels and industry reach six billion tons per year.
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In 1989, the identified carbon emissions from burning fossil fuels and the industry affected six million tons per year.
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In 1990, the First Evaluation Report was produced by the IPCC. He concludes that temperatures have risen by 0.3-0.6C over the past century, humanity's emissions are adding to the natural complement of the atmosphere's greenhouse gases, and that incorporation is expected to cause warming.
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1992 At the Earth Summit in Rio de Janeiro, governments agree on the Framework Convention on Climate Change. Its main objective is "the stabilization of greenhouse gas concentrations in the atmosphere at a level that prevents dangerous anthropogenic interference in the climate system." Developed countries commit to return their emissions to 1990 levels.
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In 1995 the IPCC concludes the second evaluation report; the balance of evidence suggests "a discernible human influence" on Earth's climate. This has been called the first definitive statement that humans are responsible for climate change.
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In 1997 the Kyoto Protocol Treaty. Developed countries commit to reduce emissions by an average of 5% in the 2008-12 period, with wide variations in the targets for each country. The United States Senate immediately declares that it will not ratify the treaty
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In 1998, strong conditions combined with global warming to produce the warmest year on record. The average global temperature reached 0.52ºC above the average for the period from 1961 to 90 (a commonly used baseline)
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In 1998 Publication of the controversial «hockey stick» graph indicating that today the increase in temperature in the northern hemisphere is unusual compared to the last 1,000 years. This work was the subject of two investigations promoted by the United States Congress
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In 1999 the human population reaches six billion.
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In 2001 the United States is removed from the Kyoto protocol by President George Bush
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In 2006 the Stern Report concludes that climate change could damage world PIB by up to 20% if left unchecked - but curb that it would cost around 1% of world PIB
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In 2006 Carbon emissions from burning fossil fuels and industry reach eight billion tons per year
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The 2007 IPCC Fourth Assessment Report concludes that it is more than a 90% chance that humanity's greenhouse gas emissions are responsible for current climate change.
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In 2007 In the ONU negotiations in Bali, governments agree on the two-year "Bali road map", hammering out a new global treaty by the end of 2009
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In 2008, two months before taking office, incoming US President Barack Obama pledged to "commit vigorously" to the rest of the world on climate change.
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In 2009 China surpassed the USA. as the world's largest emitter of greenhouse gases - despite the US It is still far ahead on a per capita basis.
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in 2009 192 governments meet for the UN climate summit in Copenhagen with high expectations of achieving a new global agreement, but the result was disappointing.
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In 2010 the so-called "ClimateGate" jumps. A series of emails from scientists showing data manipulation in favor of anthropogenic climate change theory is shown to the press
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In 2011 A new analysis of the Earth's temperature records by scientists concerned with the "ClimateGate" allegations shows the planet's land surface has actually warmed up for the past century.
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In 2011 the human population reaches seven billion
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In 2012, Arctic sea ice melted, reaching just 3.41 million square kilometers, breaking the record for the lowest extent in summer since satellite measurements began in 1979.
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In 2013, the Mauna Loa Observatory in Hawaii reports that the average daily concentration of CO2 in the atmosphere has exceeded 400 parts per million (ppm) for the first time since measurements began in 1958.
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In December 2015, the 21st edition of the climate summit will be held in Paris. It is expected to be the definitive appointment for a global agreement for the reduction of greenhouse gases, with the main objective of limiting the increase in global temperature to less than 2º C
