a poster "1. Billboard design theme "The Earth is warming, and the future is calling. Are you ready?" 2. Main visual part Left image: Showing a flooded city with gradually rising water levels, using blue and green as the main colors to create a realistic flood effect. Right image: Showing a forest engulfed by a large fire, with red and yellow flames and smoke swirling, emphasizing the urgency of the fire. 3. Central visual effects Thermometer: A large thermometer in the middle that gradually changes from blue at the bottom to red at the top, displaying a sharp increase in temperature. Earth: Display an Earth next to the thermometer, with a color gradient from blue-green to red, indicating a warming trend on Earth. 4. Slogan section Text: Care about today, change the future. Unite to fight against climate change! 5. Color combination Background color: Use deep blue to represent the sky and sea, giving a calm and composed feeling. Visual image: Blue and green are used for the flood section, and red and orange are used for the fire section to highlight urgency and contrast. Text color: White, ensuring clear visibility on a dark background." --ar 4:3