What is a digital twin? A virtual clone of a real system, such as a factory, a building or a city, which uses data to mirror its current state and behaviour .

Locals often refer to Alkmaar as “a small Amsterdam” , with a slower pace of life and a “human-size” atmosphere.

After working all of his life as a sound technician for the Bulgarian state television, Emil is now retired. He lives in a 120 square meter house in Gorni Lozen, a village not far from Sofia, but only uses its ground floor and basement because he can’t afford to heat the whole of it.

"To achieve carbon neutrality by 2050 we need more investments than those envisaged by the Green Deal , otherwise we will never make it.

In architecture, there are two kinds of sustainability: one simpler, smaller, and ethical in its relationship with the environment and with people; and another which is “fashionable”, used as a label in a speculative way, without an understanding of what it really means.

Maguy Soldevila is a former art teacher. Some years ago, she quit the frenzy and the pollution of the French city of Lyon to move into a typical house of the 1960s, in the small village of Sail-sous-Couzan.

María Regidor co-owns a mini-hydro power plant in Spain, which produces part of the electricity provided to the residents of the Castile and León region.

Peer-to-peer (P2P) platforms allow energy sharing and trading within a community without the binding mediation of the traditional big utilities.

Wind and solar energy is not constant and therefore a renewables-based society requires smart grids to transport this power from areas where electricity generation is currently high to those where it is low in order to meet demand.

For most of us, any concerns about computing speed or data storage are usually to make it go faster while storing more. We hardly ever think about the enormous amounts of energy already required to power Internet servers or charge the increasing number of devices we own.

Crowdfunding is considered by some experts to have the same effect on banks as Uber has on taxis. Green energy crowdfunding is no exception: the process is 100% digital and lets everybody become an investor or request funding for a sustainable project, without going throughthe banks.

Solar parks proliferate in Europe and boost development of renewables, but the issue of land use is often raised. A new trend is to produce energy and cultivate crops at the same time , in other words use agrivoltaic systems.

The  Paris climate change pact , which  entered into force  last year, was announced with a huge fanfare. The deal aims to limit the rise in average global temperatures to “well below” two degrees Celsius, compared to pre-industrial levels.

The use of small wind turbines (SWTs) is growing in appeal thanks to a changing trend in the energy sector, from a centralised system to a distributed one.

Getting clean energy through your own turbine without relying on a central grid sounds great, but with subsidies being cut across Europe, is it too good to be true? Those with plenty of experience with wind turbines are quick to concede the financial challenges of this green technology.

Most EU countries enforce a legal obligation to only use wind turbines certified by an accredited organisation.

“I have always been interested in the environment. As a child, I thought ‘what if the world runs out of petrol? Petrol won’t be there forever.

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.

Opponents to wind turbines often claim that the noise and vibrations from the turbines affect their health , leading to sleep disturbance, headaches and a host of other problems.

The European construction industry and home-builder citizens are increasingly aware of sustainable choices. Some solutions can be more expensive than others, although sometimes this only concerns the construction phase.