Playing games could be a solution to saving energy. Using energy more efficiently is, of course, a crucial part of fighting climate change, since oil and fossil fuels continue to be the most important energy source in the world, including Europe .

It's a brand new sector: the first steps date back to 2012. Today energy crowdfunding is a way of financing solar panel or wind turbine projects.

In the wake of the Brussels bombings, the French blogger Francis Pisani addressed the quandaries of modern, connected European cities facing terrorist threats .

Traditionally our electricity grids were designed to move power from large nuclear and fossil fuel power plants to consumers, but renewable energy will see changes to allow smaller power generation from wind and solar to be hooked up to the grid.