How do I get my boss to listen to my climate idea?

Once your working group has a proposal ready, set up a meeting with the executive decision-maker or influencer. Send the proposal in advance and create summary material for the discussion. You could also consider drafting a letter on behalf of the employee network you built and gathering signatures. If constructively worded, this can be valuable supplementary material to help get the meeting and be taken seriously. Persistence is the key to success. Getting a commitment to change will likely take more than just one meeting.