Here are the correct answers for each blank in the text:

7. **B. reduce** - "individuals must reduce waste"
8. **C. limit** - "governments must implement stricter regulations and limit protected areas"
9. **C. essential** - "The survival of endangered species is essential for sustaining the ecological balance"
10. **B. healthier** - "securing a healthier future for our planet"

So, the completed text would read:

"To address this issue, individuals must reduce waste and support conservation efforts, while governments must implement stricter regulations and limit protected areas. The survival of endangered species is essential for sustaining the ecological balance and securing a healthier future for our planet."