"Design a comprehensive corporate innovation challenge focused on environmental sustainability, targeting advanced practitioners. Outline a structured approach incorporating real-world examples and case studies. Ensure alignment with the company's sustainability goals and objectives.** Address the following key aspects:** ## 1.** Challenge framework:** Define the scope, objectives, and key performance indicators (KPIs) for the challenge. ## 2.** Employee engagement:** Describe strategies to encourage employee participation, including incentives and support mechanisms. ## 3.** Innovation pipeline:** Explain how to manage and evaluate submitted ideas, ensuring a robust and transparent process. ## 4.** Integration with corporate strategy:** Discuss methods to align the challenge with the company's overall sustainability goals and objectives. ## 5.** Case studies and examples:** Provide real-world illustrations of successful corporate sustainability innovation challenges, highlighting best practices and lessons learned."