Under the UNFCCC, governments gather and share information on greenhouse gas emissions, national policies and best practices, launch national strategies for addressing greenhouse gas emissions and adapting to expected impacts, including the provision of financial and technological support to developing countries and ooperate in preparing for adaptation to the impacts of climate change. The Convention entered into force on 21 March 1994 with aim to stabilize greenhouse gases (GHGs). Kyoto Protocol too was adopted under the UNFCCC.
• Carbon dioxide (CO2) that accounts for around three-quarters of the warming impact of current human greenhouse-gas emissions. The key source of CO2 is the burning of fossil fuels such as coal, oil and gas, though deforestation is also a very significant contributor.
• Methane (CH4) that accounts for around 14% of the impact of current human greenhouse-gas emissions. Key sources include agriculture (especially livestock and rice fields), fossil fuel extraction and the decay of organic waste in landfill sites. Methane doesn't persist in the atmosphere as long as CO2, though its warming effect is much more potent for each gram of gas released.
• Nitrous oxide (N2O) that accounts for around 8% of the warming impact of current human greenhouse-gas emissions. Key sources include agriculture (especially nitrogen-fertilised soils and livestock waste) and industrial processes. Nitrous oxide is even more potent per gram than methane.
• Fluorinated gases that account for around 1% of the warming impact of current human greenhouse-gas emissions. Key sources are industrial processes. F-gases are even more potent per gram than nitrous oxide.