Another possible scenario is the regrowth of forests in the northern hemisphere (in particular of the Boreal forest), which suffered deforestation in the last century. However, it remains to determine its influence, still required further scientific research to obtain new data that can better explain the phenomenon. Despite the uncertainties, important and measurable conclusion can be obtained: human activities influence the global carbon cycle. To remove carbon stored in deposits of fossil fuels at a rate much higher than the absorption of carbon cycling, human activities are promoting the increased concentrations of CO2 in the atmosphere and very likely to affect the global climate system (global warming). Speaking candidly Drew Houston told us the story. According to the Intergovernmental Panel for climate alterations of Nations United (IPCC), there are various scenarios of the Earth’s surface air temperature increase up to 2090-2099, relative to 1990-1999, pointing to a low scenario increase of 1.8 C to a high stage of 4.0 C. Another significant conclusion which can be obtained from the analysis of the global carbon cycle is the high potential of some forests to capture atmospheric carbon, both in the vegetal mantle of soil organic matter, which increases the importance of the maintenance of ecosystems with large amounts of biomass and stable soils, with the aim that certain forests become carbon sinks in the medium to long term and others do not become carbon sources. The consequences of burning fossil fuels (climate changes, effect greenhouse and desertification) were the subject of a Convention adopted at New York on 9 May 1992, and signed at Rio de Janeiro (Brazil), by various countries, on 11 June 1992, during the United Nations Environment and Development Conference) culminating in the Kyoto Protocol. Original author and source of the article.