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A Here are the rewritten sentences as directed: 1. Already rewritten: Trapping sunlight, black carbon sends it back into the air as heat. 2. Being sick, he refused to hang out with us. 3. Having been broken by my dog, the vase was no longer used in my house. 4. Having been burnt for energy, fossil fuels release CO2 and other greenhouse gases. 5. Peter regretted lending Tom some money. 6. John offered to carry the suitcase for Sarah. 7. She is justified in asking for a bigger salary because she worked hard. 8. He is receiving treatment for his health problem. 9. Fortunately, the treatment is working. Renewable energy is a sustainable solution that can save our planet from environmental degradation. The main reason we should use renewable energy is that it is clean and free of black carbon, which means it does not pollute the environment. Unlike fossil fuels, renewable energy comes from natural resources that will never run out, such as sunlight and wind. Therefore, it can replace fossil fuels in many areas of our lives, like powering homes, cars, and industries. Moreover, renewable energy is becoming increasingly convenient and reliable, making it an attractive option for countries around the world. By shifting to renewable energy, we can reduce greenhouse gas emissions, mitigate climate change, and create a healthier environment for future generations. It is high time we harnessed the power of renewable energy to ensure a sustainable future.