Bioenergy (aka biomass energy) is using organic matter (plants, etc.) as fuel via technologies such as gas collection, gasification (converting solid material to gas), combustion and digestion (for wet wastes).
The Greenpeace Google Search will also return results form http://archive.greenpeace.org - Greenpeace’s archive of web content dating back to 1994, along with content from those few Greenpeace websites not shared on this.