Guess the map 16: No need for that latitude!

Is it connected to the names of the towns; perhaps their origins?
 
Obviously, it is connected to the distance from Lake Erie.
 
Latitude?
 
Columbus is in red; is that important?
 
I think Columbus is quite important if you are in Ohio.
 
Proximity to the Ohio river?
 
 
Is it related to natural sources of warming gases being released ?

Do brown and green offset one another?
 
I am going to say it has something to do with the usage of natural gas for energy production.
 
I am going to say it has something to do with the usage of natural gas for energy production.
No, further away. Posts 453 - 457 are so close, it is just the last remaining option.
 
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