The word "currently" is an adverb which modifies "is". The difference between the two sentences is the relative position of "currently" and "the environment". But "the environment" is a noun phrase which has no semantic interaction with "currently"; its position relative to "currently" does not matter.
The position of an adverb would be critical, if it changes what the adverb applies to. If a sentence has multiple clauses, and the adverb moves from one clause to another, that will almost certainly change the meaning.
Another example is if there is a compound verb in a clause:
You had better quickly run and hide.
You had better run and quickly hide.
In the first sentence it is ambiguous whether quickly applies to "run and hide" or just to "run". In the second sentence, it applies only to hide.
(Since we are swapping the position of a verb and adverb, and verbs interact with adverbs, and relative position of words in English influences meaning, we have to suspect there is a difference in meaning.)