They've got template letters for sending to politicians on the topics of greener death options and other related stuff. Maybe you can help your politicians know that it's an option that people want.

I want to be composted, personally. I hate those 'put your cremains in a seedling pot and turn into a tree' things because cremains can't nourish anything. Skip the cremation, have a green burial or be composted, and ACTUALLY nourish a tree! I'd have thought green burials and human composting would be an easier sell because of the popularity of those cremains tree things, but apparently not.

Soapbox time: you (almost certainly) do not have to have your loved one embalmed. Bodies are safe and clean and won't smell if kept appropriately. If you are utilising the services of a funeral home and they tell you they won't (or can't) let you have an open casket or other viewing without the person being embalmed, it will be a policy of the funeral home at highest authority. It almost certainly is not the law, as much as some of these homes may try to convince you it is. If it is the law, make them explain which law it is and check. Bodies do not have to be embalmed for viewings. You can take your loved to another funeral home who doesn't pull that rubbish and they will have to release the body. Death is not an emergency and you can take a little time to know your rights and the law before being strong armed into an expensive and unnecessary procedure like embalming. Do it if you want to do it. Don't do it because you've been pressured into it in a time of grief.