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15

No. The worst greenhouse gas is water vapor (H2O). But water is responsible for the natural greenhouse effect. CO2 is the greenhouse gas with the "least" effect on global warming but with the most quantities available in the atmosphere resulting from anthropogenic influence/sources. Therefore, all greenhouse gases are compared to CO2, and we talk about CO2-...


10

Yes, anthropogenic emissions of CO2 are a real threat: the scientific evidence for this is overwhelming. The IPCC summaries provide, every 6 or 7 years, an overview of all the science. The most recent completed one is AR4; AR5 is being finalised now, for publication over 2013-2014. The physical science basis is summarised by IPCC Working Group 1 And yes, ...


3

A couple of factors. Methane is a greenhouse gas but can be produced in some ways sustainably (methane digesters, etc). It has the lowest energy density per volume or weight. It is also lighter than air. Nitrogen has a molecular weight of 14, while methane is at 10. Ethane, Propane, and so forth are going to be heavier than air. Ethane has a molecular ...


2

You can work out an approximation based on percentage components and the energy cost to liquify air. Assume that the energy comes from electricity and you can derive your figures. This gives you a first approximation. However it gets messier than that, as in cleverly designed plants, you can recover much of the energy used by using the chill to precool ...


2

There are standartized Systems for bottled gas, but I can't say how ubiquitous they are - see gas cylinders. Here in Germany a common size is I think about 10 kilo of Buthane. Maybe the wikipedia article provides you with some keywords to search for different suppliers. Note that for very good reasons they may only be refilled by authorized personnel. An ...


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