Just wondering what has the greatest greenhouse effect

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CFC-11 and HFC-23 have significantly higher greenhouse effects compared to carbon dioxide, methane, and nitrous oxide when measured on a per-pound basis over a 100-year period. Carbon dioxide (CO2) is defined as having a Global Warming Potential (GWP) of 1. Methane (CH4) has a GWP of approximately 25, while nitrous oxide (N2O) has a GWP of about 300. CFC-11 has a GWP of around 5,300, and HFC-23 has an even higher GWP of about 15,000, indicating that these chlorinated compounds are far more potent greenhouse gases than the others listed.
nwag93
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Which of the following has the greatest greenhouse effect, on a per-pound basis?

CFC-11

Carbon Dioxide

HFC-23

Methane

Nitrous Oxide
 
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Defining the effect of CO2 as 1 GWP (Green House Potential) (On a 100 years base), we have

Effect of CO2 is 1 GWP
Effect of CH4 is about 20 GWP
Effect of N2O is about 300 GWP.

I don't know about the Chlorinated compounds, but it is high
 
I found some more numbers on wikipedia https://en.wikipedia.org/wiki/Global-warming_potential

Again, on a 100 years base

Effect of CO2 is 1 GWP
Effect of CH4 is about 25 GWP
Effect of N2O is about 300 GWP
Effect of CFC-11 is about 5300
Effect of HFC-23 is about 15000
 
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