If not, don't feel bad, because most Americans haven't. It is essentially a blueprint for a "sustainable world" that was introduced at the UN Conference on Environment and Development in Rio de Janeiro, Brazil in 1992. Since then, it has been adopted by more than 200 counties and it has been modified and updated at other UN environmental summits. The philosophy behind Agenda 21 is that our environmental problems are the number one problem that we are facing, and that those problems are being caused by human activity. Therefore, according to Agenda 21 human activity needs to be tightly monitored, regulated and controlled for the greater good. Individual liberties and freedoms must be sacrificed for the good of the planet. If you are thinking that this sounds like it is exactly the opposite of what our founding fathers intended when they established this nation, you would be on the right track. Those that promote the philosophy underlying Agenda 21 believe that human activity must be "managed" and that letting people make their own decisions is "destructive" and "dangerous". Sadly, the principles behind Agenda 21 are being rammed down the throats of local communities all over America, and most of the people living in those communities don't even realize it.