https://www.science.org/content/article/producing-circuit-boards-leaves-would-prevent-millions-tons-e-waste In a literally green technological advance, a team of researchers has found a way to replace the conventional printed circuit board (PCB) in electronic devices with a biodegradable alternative made out of tree leaves. Reported earlier this month in Science Advances , such “leaftronics” could help reduce the tens of millions of tons of electronic waste , or e-waste, humanity produces every year.