Here are the words that differ from the others in terms of primary stress:

1. A. climate (primary stress on the first syllable) - **B. protect (second syllable)**, C. damage, D. forest
2. **A. reduce (second syllable)** - B. reuse, C. pollute, D. happen
3. **A. recycle (second syllable)** - B. energy, C. tourism, D. animal
4. A. animal - B. pollution, C. **restaurant (third syllable)**, D. tourism
5. A. hotel - B. nature, C. plastic, **D. dirty (first syllable)**
6. **A. natural (first syllable)** - B. garbage, C. reduce, D. even
7. **A. poison (first syllable)** - B. pollute, C. reuse, D. disease
8. **A. Tourism (first syllable)** - B. air conditioner, C. damage, D. electricity

In each case, I highlighted the option that has a different primary stress compared to the other choices.