The ChatGPT Prompt used was mark this document up with syllable stress and schwa [paste text here].  use an easy to understand method which isn't dependent on phonetic symbols.

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Perfect — let’s make this classroom-friendly.  Instead of IPA, I’ll mark:

• Bold = the stressed syllable.

• ə = schwa.

• I’ll break words into parts with dots.
  
  

Paragraph 1

Sci·en·tists warn the world will have more ex·treme heat.
Ex·perts from the EU’s Earth Ob·ser·va·tion Pro·gramme an·a·lysed tem·pə·ra·tures from sat·el·lites, weath·er sta·tions and oth·er da·ta·bas·es.
Their fig·ures in·di·cat·ed a high like·li·hood of more ex·treme tem·pə·ra·tures.
Last month was the sec·ond warm·est June on rec·ord for Eu·rope.
There were heat·waves over west·ern North A·mer·i·ca.
Many high tem·pə·ra·ture rec·ords were bro·ken in Can·a·da and the U·S·A.

Paragraph 2

UK me·te·or·ol·o·gists said we have to get used to more rec·ord high tem·pə·ra·tures.
They said many re·gions are ex·pe·ri·enc·ing heat·waves.
They add·ed that rec·ords are being bro·ken by larg·er mar·gins.
They re·port·ed that Can·a·da’s recent "heat dome" weath·er e·vent was an ex·am·ple "not just of ex·treme tem·pə·ra·tures, but of ex·tra·or·di·nar·i·ly ex·treme tem·pə·ra·tures."
The sci·en·tists warned of a warm·er world with more droughts and heat-re·lat·ed deaths.

Learners can see:

• Where the main stress falls (bold).

• Where the schwa sound (ə) replaces a clear vowel.
  
  

Would you like me to also highlight only the schwa syllables in a different color or symbol (like (ə)), so your students can focus practice specifically on reducing vowels?