It’s not just a want though ... you are compelled to include your grandchildren. You have time now that you didn't have as a parent. Your children are just as busy as you were (if not more) and so you are in the fortunate position to do great things with your grandchildren.
You love how, as a generation, they are environmentally conscious. They see through a different set of lenses the beauty and hurt that surrounds them. You notice, how they are challenging the status quo. They are demanding business/life balance in a positive way.
You know you can help your grandchildren while leaving a legacy — your legacy — by tapping into your combined eco-consciousness. You will guide them and you will learn from them.