Climate change means a change of climate which is attributed directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable time periods (United Nations Framework Convention on Climate Change) Its primary consequence is global warming.
The factor with the greatest impact on climate change is pollution of carbon dioxide (CO₂), which is produced from burning fossil fuels. The second factor with the greatest impact on climate change is methane (CH4), which mainly comes from fertilizers used in agriculture, followed by nitrogen oxide (NxOy), produced by vehicles. The other gases that contribute to climate change (hydrofluorocarbons, water vapour, perfluorocarbons and sulphur hexafluoride) are involved in a large number of industrial processes.
The sector that produces the most emissions of greenhouse gases (GHG) is non-renewable energy production.
Consequences of climate change include:
Global warming, i.e. the increase in the Earth's average surface temperature
Loss of glaciers and sea ice
Rising sea levels
Extinction of species and ecosystems
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