A split-screen environmental illustration showing a lake ecosystem before and after pollution cleanup. On the left side: polluted lake water with green algae bloom, murky water, floating trash like plastic bottles and waste on the shore, dull lighting, unhealthy ecosystem.
On the right side: clean, clear blue water with sunlight rays, healthy fish swimming, aquatic plants, vibrant colors, pristine shoreline. Above and below water perspective, realistic yet slightly illustrative style, high detail, environmental contrast, nature conservation theme.