https://www.science20.com/a_future_look_at_today/save_twenty_percent
It is generally accepted that America could immediately reduce energy consumption by at least 20% if intelligent conservation efforts were implemented at all...
save twentypercentenvironmentscience
https://grist.org/article/2009-07-13-twenty-ideas-that-could-save-the-world/
Ask Chris Rapley, the ebullient physicist and director of the Science Museum in London, why he seems more sanguine about our prospects of taming climate change...
twentyideascouldsaveworld