1. News report style: "In the bustling city of Delhi, smog blankets the skyline. Experts warn of the health risks of air pollution and urge the government to take action. Solutions like stricter emissions controls and promoting electric vehicles are being considered."

2. First-person account: "As I walked through the rainforest in the Amazon, I was devastated by the sight of trees being cut down. I joined forces with local activists to protest deforestation and promote sustainable logging practices."

3. Descriptive beginning: "The crystal-clear waters of the Great Barrier Reef shimmered under the Australian sun. But beneath the surface, corals are dying due to rising ocean temperatures. I embarked on a mission to raise awareness and advocate for measures to combat climate change."