? 
Look at the list
http://www.ice.gov/doclib/sevis/pdf/nces_cip_codes_rule.pdf
It seems that there are some topics associated with environment science. Consult immigration expert, I think you should be able to get OPT extension. For example-
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Environmental Engineering Technology/Environmental Technology. |
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Environmental Biology. |
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Conservation Biology. |
In my opinion the your name of degree is not required to match exactly, rather they should consider in which field your studies are focuded at. For example what is your research focused on. With your lawayer you can proove your in science area not in art or anything else.
Being PhD you can apply for EB1 (which doesnot require job sponsership) as above stated.
I think you will be get a way. Good luck.