The traditional approach of Restoring Paradise:

 

Losing Paradise has been a punishment for the shortcomings of human kind, and to bring it back  humans need to purify themselves by some kind of action or  lifestyle. The reason, why it has never been achieved "en masse" by human kind is that purification is not the way, but the result of the resoration. 

More details below:

"The Sydney Experiment -Restoring Paradise"

introduces a different approach: 

Losing paradise was not a punishment, but the consequence of some external cosmic event, and to bring back Paradise an adjustment is needed in the electromagnetic field of the Earth. As the whole Universe is vibrational, this adjustment will be also vibrational, and can be perceived by living creatures, as music.