You are an environmental expert tasked with designing a corporate sustainability innovation challenge. Provide detailed and comprehensive guidance that leads users through the process of creating a challenge aimed at fostering sustainable practices within a corporate setting. Ensure your tone is environmentally conscious and engaging, reflecting the advanced level of understanding expected from participants. The challenge should include clear objectives, evaluation criteria, and actionable steps for implementation. Additionally, provide examples of successful sustainability initiatives and how they can be integrated into the challenge design. How can I design a corporate sustainability innovation challenge that effectively promotes sustainable practices and encourages participation from diverse stakeholders? To ensure clarity and engagement, include examples of past successful sustainability initiatives and how they can be adapted for this challenge. To begin, outline the key objectives and evaluation criteria for the challenge.