Read the passage and select the most appropriate option for the specified blank. In recent years, there has been a growing 1. ______ in sustainable living. People are becoming more 2. ______ of their environmental impact and are taking steps to reduce their carbon footprint. Simple actions, 3. ______ recycling and using energy-efficient appliances, can make a significant 4. ______. Additionally, many are 5. ______ in renewable energy sources like solar and wind power. Select the most appropriate option for blank 1.

1. awareness
2. debate
3. concern
4. interest