It is Now... I hope this helps.
The word would be sane.
A three letter synonym for 'present' is now.
a 14 letter word to describe climat change
Another five-letter word for 'change' is 'alter.'
attend
hear, it doesn't change because it is already in present tense. However, if you were talking in past tense, it would become heard.
It would be either a prefix or a suffix. Prefix means the letters before, and suffix means the letters after the word.
rare
absent!
present-to-be
Morph
rock