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- http://www.cngnow.com/what-is-cng/Pages/default.aspx
- http://www.looptt.com/content/10-benefits-using-compressed-natural-gas-cng
- https://www.conserve-energy-future.com/pros-and-cons-of-natural-gas.php
- https://afdc.energy.gov/vehicles/how-do-natural-gas-cars-work
-https://www.government-fleet.com/302899/whats-the-future-for-cng

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- The countries who use CNG are MEDC's who can afford to try new alternatives to petroleum/diesel/gasoline
- Countries want to use this source because in some ways it is much cheaper than other forms of energy, but it is hard to get every user in the country or city on board with the idea
- Since this is a limited resource with limited stations for providing CNG, also arising with limited experience, it is hard to tell if this resource is effective and is worth putting into daily, moderated use.

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-- Compressed natural gas is a non-renewable resource, so it is not sustainable and it will run out in due time
-- CNG requires a strong investment which means training technicians, building up infrastructure, buying new vehicles, etc.
CNG doesn't work for everyone. There are limited CNG stations around the USA, far less than gas and diesel that you see on every street.
- A large amount of money will have to be invested in this resource if success should happen --if there is hesitation than it will fail and money will be lost.

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1. Buying a CNG vehicle is more expensive than buying a petroleum vehicle; it's a shift not everyone is willing to make
2. Non-renewable resource and will one day expire (because it is a fossil fuel); therefore not sustainable
3. The infrastructure for pipelines for CNG is extremely expensive as special construction systems need to be installed and used; if a pipe leaked, it would be costly and one would not be able to tell very quickly because it is tasteless, odorless, and colorless

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1. CNG burns cleaner than diesel and petrol; this has reduced carbon monoxide emissions by 80%
2. CNG is a TON cheaper than diesel, super, or premium/abundant supply
3. CNG has a low flammability rating which makes CNG cylinders safer than diesel and gasoline tanks because of their size, location, and structure in a vehicle -- CNG is also not a fire hazard like gasoline or diesel because it is lighter than air
4. CNG is a cleaner fuel with no traces of heavy metals, sulphur, particulate matter, or toxic additives

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How does compressed natural gas work in vehicles and to generate energy? 

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How does compressed natural gas work in vehicles and to generate energy? 

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-- Fuel-air mixture is ignited and compressed by a spark plug --> CNG is stored in the fuel tank at the back of the vehicle and the CNG fuel system transfers high pressure natural gas from the cylinder to the engine

-- Also used more simply in steam generation units in which fossil fuels are heated in a boiler to produce steam through heating water -- turns a turbine to generate electricity

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What materials are needed?/What parts of the world does it come from? 

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What materials are needed?/What parts of the world does it come from? 

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-- The main component of natural gas is methane but it is also composed of ethane, propane, butane, and more. Other components like CO2, water vapor, and nitrogen are taken out during processing to improve the quality; this makes it easier for it to flow great distances through pipelines.

-- According to eia.gov, The United States of America is the world's top producer of natural gas and has been since 2009. Following closely behind are Russia and Iran.
Primarily MEDC's use CNG.

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Compressed Natural Gas is found near oil wells during extraction

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According to CNG Now!, Compressed Natural Gas is a readily available alternative to gasoline
-- also referred to as an organic compound
-- fossil fuel (essentially methane made up of carbon and hydrogen)

CNG is made by compressing natural gas to less than 1% of its volume at standard atmospheric pressure