Yes, there are several eco-friendly alternatives to greaseproof paper such as unbleached parchment paper, silicone mats and non-stick baking mats. These options are made from sustainable materials and can be reused multiple times, making them a more environmentally friendly option.
Additionally, using alternative methods to line a baking tray without greaseproof paper can also greatly reduce waste and help protect the environment.  So next time you bake, consider opting for one of these eco-friendly alternatives.