There is always an amount that is affordable and the impact on the environments is beyond measure. When one neighbor sees another go solar they are more inclined to follow suit. So the savings can be through a small example.
Some locales are more cost effective than others, the main action is to look into it. Too many people just assume that it will is beyond their means without investigation. It costs nothing to find out.
Saving the planet from plastic is a whole other topic and can of worms. Do what can be done for the bags and giving up straws can help too. It is small actions over time that make the biggest difference.
Thanks for your input!