Cryptic crossword clue
Core of students warning: stop environmental change 13

The most common and most likely answer to this crossword clue is the 13 letter word DEFORESTATION

I've seen this crossword clue in The Daily Telegraph
D
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Buddy explains!

The straight part
We know that "environmental change//" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case environmental change// = deforestation.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does DEFORESTATION mean?

DEFORESTATION noun
  1. The process of destroying a forest and replacing it with something else, especially with an agricultural system.
  2. A transformation to eliminate intermediate data structures within a program.

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