A few months back, I heard about Shai Agassi, an entrepeneur in California who is raising millions of dollars for a Project to create the infrastructure for electric cars to become a real alternative to fossil-fuel-powered models. The plan is to invest in "power stations", where cars can simply sway their empty batteries for charged ones - just like with a petrol station.

Over the last weeks, this project has gotten a lot of media attention, most prominently with Israel buying into the idea to create an oil-independent country.

Here is their submission to the "what can you do to make the world a better place?" World Economic Forum's Davos challenge. In today's complex world, if an idea is simple enough so a child can understand it, it has a chance of getting popular support. If a child can explain it, all the better.

We need more simple ideas like this with people like Shai Agassi to see them through.