The concentration of carbon dioxide is approximately 30 per cent greater than it was in the 18th century, before the industrial revolution. It has increased from around 280 parts per million (ppm) to approximately 360 ppm today. Although carbon dioxide comprises only 0.036 per cent of the air, its warming effect is significant. Methane levels have risen from a pre-industrial concentration of about 700 parts per billion (ppb) to 1700 ppb.

Greenhouse gas emissions are gases that trap heat in the Earth's atmosphere. Without greenhouse gases the average global temperature would go from 59 degrees Fahrenheit to 0 degrees Fahrenheit. The most notable greenhouse gases are carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), halocarbons that contain fluorine such as hydrofluorocarbons (HFCs) and perfluorocarbons (PFCs), and sulfur hexafluoride (SF6) (EPA 2003c). Each greenhouse gas differs in its ability to hold heat.

Scientists know for certain that human activities are changing the composition of Earth's atmosphere. Increasing levels of greenhouse gases, like carbon dioxide (CO2 ), in the atmosphere since pre-industrial times have been well documented. There is no doubt this atmospheric buildup of carbon dioxide and other greenhouse gases is largely the result of human activities. It's well accepted by scientists that greenhouse gases trap heat in the Earth's atmosphere and tend to warm the planet.

The natural concentrations of greenhouse gases such as carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) are regulated by the Earth and its biosphere through uptake and release by natural cycles and through destruction in the atmosphere. However, since the industrial revolution, the emissions of these gases have been significantly increased in a relatively very short time mainly due to burning of fossil fuel, industrial processes, and increase in agriculture activities.

Concentrations of NMOC in uncontrolled landfill gas can vary depending on several factors, including the type of waste discarded in the landfill, the climate surrounding the landfill, and the physical properties of the individual organic compound. A default concentration of 595 parts per million by volume (ppmv) of NMOC is presented in EPA’s Compilation of Air Pollutant Emission Factors (AP-42).

Landfill gas recovery projects provide a highly effective means of reducing overall greenhouse gas emissions from landfills, whether the landfill gas is combusted by flare, electricity generation equipment, or another end use system. By using the otherwise wasted methane contained in the collected landfill gas to generate electricity or directly as a fuel, fossil fuels such as oil and coal are displaced.

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.

Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2004. U.S. EPA, Office of Atmospheric Programs. EPA/430/R-06-002. April 15, 2006. This report presents estimates by the United States government of U.S. human-related greenhouse gas emissions and sinks for the years 1990 through 2004. The information provided in this inventory is presented in accordance with the Revised 1996 Intergovernmental Panel on Climate Change (IPCC) Guidelines for National Greenhouse Gas Inventories.

One of the strongest pieces of evidence for human-induced climate change is the consistent rise in carbon dioxide (CO2) in modern times, as measured at the Mauna Loa Observatory in Hawaii, where CO2 has been observed since 1958. As of 2005, the concentration of CO2 in Earth’s atmosphere was about 378 parts per million (ppm).

There are six main greenhouse gases, the most common of which are carbon dioxide (C02), methane (CH4) and nitrous oxide (N20). These are all produced from human activity - C02 from transport and energy; CH4 mainly from animals burping out the gas as they digest their food; N20 mainly from agriculture such as the use of fertiliser and when animals urinate.

Carbon dioxide (the key factor in climate change) and other greenhouse gases come mainly from the exhaust pipes of cars, trucks and other vehicles, and from the stacks of power plants and industries that burn coal, oil, and gas. In Canada the biggest source of carbon dioxide is transportation -- approximately one-quarter of the total. Industries are not far behind contributing 19 per cent.

Yes. A whole series of other feedbacks will influence the concentration of greenhouse gases in the atmosphere. Not all the CO2 that we put into the atmosphere stays there. Some is absorbed by vegetation and a lot is taken up by the oceans. If CO2 absorption rate changes, then the rate of build-up in the atmosphere will also change, potentially speeding up, or slowing down, global warming. One way to increase the build-up of CO2 would be to chop down all the tropical forests.

The rate being charged for natural gas has been lower than the actual cost of the gas since this past December. The recent 27 cents per ccf (hundred cubic feet) increase in the Purchased Gas Cost (PGC) rate brings the rate closer to the actual cost of the gas. To reduce the financial impact on customers, the Gas Distribution Charge rate has been decreased almost 10 cents per ccf. The net increase is approximately 17 cents per ccf.

CSIRO collects extensive data on atmospheric composition from the remote Cape Grim Baseline Air Pollution Station in Tasmania as well as from observatories around the world. The Station is the foremost facility of its type for monitoring pollutant levels in southern hemispheric air. It is operated jointly by the Australian Bureau of Meteorology and CSIRO. For a far longer record of atmospheric make-up, CSIRO researchers extract air from ice cores supplied by the Australian Antarctic Division.

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 2001, Australia produced 528.1 million tonnes of carbon dioxide equivalent -- this was mainly carbon dioxide (69.9%) as well as methane (22.9%), nitrous oxide (6.3%) and other gases. Of Australia's total net emissions in 2001, the production of energy accounted for 68.0%, 19.5% came from agriculture, emissions from industrial processes contributed 4.6%, and waste emissions contributed 3.1%.

The NSW Government has established an emissions trading scheme that aims to reduce greenhouse gas emissions associated with the production and use of electricity. More details can be found at www.greenhousegas.nsw.gov.au

Every day millions of cows and sheep in New Zealand are burping the greenhouse gas methane (CH4) into the air as they digest their food. CH4 is also released when these animals chew cud. It is produced by the bacteria that live inside their stomachs - these bacteria are essential for the animals to digest the grass they eat. Methane from farm animals is an important issue because of the increasing number of such livestock being farmed worldwide.

By 2010, the Climate Savers Computing Initiative seeks to reduce global CO2 emissions from the operation of computers by 54 million tons per year, equivalent to the annual output of 11 million cars or 10–20 coal-fired power plants.5 Under the assumptions detailed below (see footnote No. 6), total power consumption for PCs shipped in 2010 will be reduced by over 50%, for a total savings of 62 billion kWh in 2010, worth more than $5.5 billion (at an average cost of $0.0885/kWh).

Answer: Natural gas is America's most popular home-heating fuel because it is efficient, clean and reliable. In the United States, 52% of all heated homes have natural gas heat. And natural gas is increasingly popular for use in new home construction, businesses and electric generating facilities. Demand for natural gas has increased even during the summer months because that is when the use of electricity increases and many power plants use natural gas to produce electricity.

Demand for natural gas is rising, but supply is not keeping pace. For more than a decade, the federal government has encouraged the use of natural gas because it is a relatively clean-burning fuel and most of the natural gas that we use is produced here in the U.S. In particular, the use of natural gas to generate electricity has been encouraged. But, U.S. gas-producing areas are maturing and it has become harder and harder for producers to find new supplies.

a car with its windows rolled up on a sunny day keeps the sun's warmth inside the car, carbon dioxide or any other greenhouse gas has the ability to prevent the reflection of solar radiation back out into space. The greenhouse effect is a natural phenomenon. It is the reason our day and night temperature differences are so narrow.

The greenhouse is sold unassembled. This helps us to keep both shipping and greenhouse kit costs low. Each kit comes with complete written instructions and computer generated drawings. The framing is color coded for convenience and of course, we’re always here to help. The greenhouses are shipped in a couple long skinny boxes and an octagonal box for the rolled Solexx panels. The 8' Garden Oasis, for example, comes in five boxes: two 8' x 7.

Meeting the Kyoto targets will require public and private investments. Many industrialized governments that have ratified the Protocol have already begun implementing domestic policies and regulations that will require emitters to reduce greenhouse gas emissions, according to the established targets. So far, experience has shown that the cost of reducing one ton of carbon dioxide (a greenhouse gas) can cost from $15 up to $100 in industrialized countries.

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.

Global warming is of urgent importance and demands immediate action. In the absence of a cohesive national policy, states have a responsibility to track emissions and encourage voluntary greenhouse gas reductions. A greenhouse gas database will allow businesses to establish baselines against which to measure their progress in the (likely) event of future regulatory schemes. Companies can take the lead in solving this critical problem, creating a model for others to follow.

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%).