Conventional and centralized power production is the dominated reason for the global worming

 Electricity and heat account for about 25 percent of global greenhouse gases (GHG) emissions, making it the largest sector. This is equivalent to 32 percent of global CO₂ emissions and 43 percent of CO2 emissions from energy-related sources. Within this sector, electricity generation accounts for the largest share, at 68 percent of the sector and 17 percent of global GHG emissions. Heat (including combined heat and power) amounts to about 5 percent of worldwide emissions, and other energy industries92 account for roughly 3 percent. More than 40 percent of all electricity is consumed in buildings, either residential (23 percent) or commercial and public (19 percent, collectively). Industry accounts for a further 35 percent of all electricity use. About 9 percent of electricity is consumed in energy production and processing (for example, refineries), with an equal amount lost in transmission and distribution (transmission and distribution losses are significantly higher in developing countries). Relatively small amounts are consumed in agriculture (2.3 percent of total) and transport (1.4 percent, mostly from rail). With respect to fuel types, coal powers 38 percent of global electricity supply.

Gas, nuclear, and hydropower follow with shares of 20, 17, and 16 percent, respectively Residential and industry sectors dominate public heat consumption, at 39 and 33 percent of the global total, respectively.94 Smaller amounts come from energy production and processing (9 percent), other buildings (8 percent), and distribution losses (7 percent).In terms of fuel sources, most heat is generated by gas (53 percent) and coal (36 percent).Electricity and heat-related CO₂ emissions of the top emitting countries, in both absolute and per capita terms. Together, these countries account for 88 percent of global emissions from this sector, with the 10 largest emitters accounting for 81 percent. The United States, China, and the EU-25 are by far the largest emitters (25, 16, and 14 percent, respectively, of the global total for this sector). The largest per capita emitters, in order, are Australia, the U.S., Saudi Arabia, and Russia.

Anthropogenic emissions of GHG occur in every country of the world. These emissions result from many of the industrial, transportation, agricultural, and other activities that take place in each country. Countries that are signatories to the United Nations Framework Convention on Climate Change (UNFCCC) are committed to reporting their anthropogenic emissions of greenhouse gases to the Secretariat of the convention.Once, all climate changes occurred naturally. However, during the Industrial Revolution, we began altering our climate and environment through changing agricultural and industrial practices. Before the Industrial Revolution, human activity released very few gases into the atmosphere, but now through population growth, fossil fuel burning, and deforestation, we are affecting the mixture of gases in the atmosphere.

Greenhouse gases are global in their effect upon the atmosphere. The primary greenhouse gases, unlike many local air pollutants like carbon monoxide, oxides of nitrogen, and volatile organic compounds, are considered stock pollutants. A stock air pollutant is one that has a long lifetime in the atmosphere, and therefore can accumulate over time. Stock air pollutants are also generally well mixed in the atmosphere. As a consequence of this mixing, the impact a greenhouse gas has on the atmosphere is mostly independent of where it was emitted. These characteristics of greenhouse gases imply that they should be addressed on a global (i.e., international) scale.

Some greenhouse gases occur naturally in the atmosphere, while others result from human activities. Naturally occuring greenhouse gases include water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Certain human activities, however, add to the levels of most of these naturally occurring gases:

Carbon dioxide is released to the atmosphere when solid waste, fossil fuels (oil, natural gas, and coal), and wood and wood products are burned.

Methane is emitted during the production and transport of coal, natural gas, and oil. Methane emissions also result from the decomposition of organic wastes in municipal solid waste landfills, and the raising of livestock. More information on methane.

Nitrous oxide is emitted during agricultural and industrial activities, as well as during combustion of solid waste and fossil fuels.

Very powerful greenhouse gases that are not naturally occurring include hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF₆), which are generated in a variety of industrial processes.

Each greenhouse gas differs in its ability to absorb heat in the atmosphere. HFCs and PFCs are the most heat-absorbent. Methane traps over 21 times more heat per molecule than carbon dioxide, and nitrous oxide absorbs 270 times more heat per molecule than carbon dioxide. Often, estimates of greenhouse gas emissions are presented in units of millions of metric tons of carbon equivalents (MMTCE), which weights each gas by its GWP value, or Global Warming Potential.

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