You've hit a great point to use in arguing reality with those who say they haven't heard of Agenda 21. So much of what the left believes in proves itself to be destructive or worse because they take great pains to disguise what they are doing and promote their causes in somewhat secretive ways.
California has legislated Agenda 12 in a bill AB 32.
Jerry Brown is a huge supporter of Agenda 21, because it sends money and business to his commie buddies in China.
In return his ‘investments’ in China for his personal fortune do quite well.