theory?
hypothesis?
mmm .... i could never work out which was correct ....
Global Warming is unlikely to be confirmed one way or another until some time in the future.
If it is phoney we may never know it!,
but if it is true then the consequences will be more than we currently observe; although proving man's direct influence may never be certain.
Once Nature loses control of her feedback mechanisms, such as permafrost locking methane in store, then what man in his wisdom has done may be the least of our worries.
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