Natural gas is primarily methane, which is a major greenhouse gas. Methane is emitted directly to the atmosphere from sources such as leaks in natural gas wells and pipelines and is produced in landfills, sewage treatment facilities and livestock operations. Other major greenhouse gases, carbon dioxide and nitrous oxides are produced when natural gas is burned for heating and electric power production.

The greenhouse gas estimates presented here are full fuel-cycle estimates, combining the three major greenhouse gases emitted by motor vehicles: Full fuel-cycle estimates include all steps in the use of a fuel, from production and refining to distribution and final use. This gives a more complete picture of the climate change impacts of using a particular fuel. Some greenhouse gases have greater impacts on climate than others.

All Canadians need to get involved in reducing emissions of greenhouse gases that cause climate change, as well as air pollution. Making use of the Government's public transit tax credit and increasing your use of public transit to help reduce traffic congestion and air pollution in our cities, and greenhouse gas emissions that impact on our climate. Consulting the ecoENERGY for Personal Vehicles program to help you choose more eco-friendly vehicles.

In 2005, there were 18.2 trillion cubic feet (Tcf) of dry natural gas produced in the U.S. The top producing states are:

EIA does not collect daily spot price information, but instead relies on a private vendor. EIA publishes daily spot prices for the Henry Hub, Transco Zone 6 NY, Chicago, and an average for selected California locations on a weekly basis and these can be found in the Natural Gas Weekly Update (NGWU). A time series of the daily spot price data for these locations and all others in the Lower 48 States are available from the data vendor, Intelligence Press, Inc.

EIA provides international natural gas prices for selected countries by sector (electric generation, household, industry).

Residential consumers in some States have the opportunity to choose their supplier for the natural gas itself. Suppliers are either the local distribution company or approved gas marketers. Regardless of supplier, the local distribution company continues to provide local transportation and distribution services. Learn More: To find out more about States that have "customer choice" programs, see Natural Gas Residential Choice Programs. Yes.

U.S. residential natural gas prices are projected to average $13.52 per thousand cubic feet (Mcf) this winter , 6.3 percent higher than last winter’s price of $12.36 per Mcf.

Numerous underlying factors affect natural gas prices. Depending on the factor-for example, production, imports, demand, oil prices, and natural gas inventories -- each can apply either upward pressure () or downward pressure () or neutral pressure on prices (). Increasing Production - Total domestic production of dry natural gas is projected to increase 1.4 percent in 2007 and is expected to increase an additional 1.3 percent in 2008.

In 2005, nearly 58 percent of all households (residential sector) used natural gas as their primary heating fuel accounting for about 22 percent of total natural gas consumed in the United States.

In 2006, the U.S. consumed nearly 22 trillion cubic feet (Tcf) of natural gas by the following seven natural gas end users:

There are several ways that total underground working gas capacity may be measured. The Energy Information Administration (EIA) estimated in mid 2006 that, after adjustment for operational considerations that hinder the attainment of full storage at all fields simultaneously, a likely practical estimate for maximum industry-wide working gas capacity is roughly 3.6 Tcf. However, based on design capacity estimates, U.S. working gas capacity was 4.01 Tcf as of the end of 2005.

Businesses that take steps to reduce their greenhouse gas emissions are likely to see an increase in efficiency, helping them save money and setting the bar higher for their competition. Considering that most lawmakers and citizens believe regulatory limits on GHG emissions are inevitable, companies that are early to respond to climate change and pollution will have a technological and economical advantage over their competitors.

For the U.S., carbon dioxide released by burning oil, coal and natural gas makes up 82% of total greenhouse gas emissions (weighted by climate-change impact), according to the federal Department of Energy. The remainder is methane (9%, from landfills, coal mines, oil and gas operations and agriculture); nitrous oxide (5%, from burning fossil fuels and from certain fertilizers); refrigerants and other "engineered" chemicals (2%); and carbon dioxide from other sources (2%).

the country level, CAIT includes emissions of (1) CO2 from fossil fuels and cement (1850-2002), (2) CO2 from land-use changes (1950-2000), (3) and non-CO2 gases, such as methane (CH4) and nitrous oxide (N2O) (1990, 1995, 2000). CAIT also includes sector-level GHG data, broken down by energy (with five subsectors, such as electricity & heat), industrial processes, agriculture, land use change and forestry, waste, and international bunkers.

Based on 2002 data (the latest available), the U.S. is responsible for nearly 22% of the world's CO2 emissions from fuel-burning. Because fewer than 5% of the world's people are Americans, per capita we emit 5 to 6 times as much CO2 as the average non-American; historically, the disparity is even greater. (Carbon dioxide molecules persist in Earth's atmosphere for around a century, which means that our past emissions are causing climate change now and in the future.

Sooner or later, yes. Because CO2 stays in the atmosphere for about a century, simply freezing the annual emissions won't stop the atmospheric concentrations rising. To stabilize the atmospheric levels of CO2, be it at double, triple, quadruple preindustrial levels (or more), will eventually involve phasing out fossil fuels entirely. This is extraordinarily difficult.Fossil fuels are the basis of modern urban civilization.

Major industrial sectors, including electricity produced by combustion, oil and gas, base metal smelters, iron and steel, some mining sectors, cement, forest products, and chemicals production contribute about half of Canada's greenhouse gas emissions that cause climate change. Industry produces about half of Canada's greenhouse gas emissions that cause climate change and our plan sets mandatory targets for them to reduce these emissions.

Once emitted, GHGs can remain in the atmosphere for many years, from approximately 10 years to thousands of years, depending on the gas. This means that emissions from a long time ago are still in the atmosphere and still affecting the Earth's climate system. Countries in the developed world have been emitting substantial quantities of GHGs since the start of the industrial revolution in the mid-18th Century.