Imagine living in a building that once leaked heat in the winter and baked in the summer, now retrofitted to be a haven of comfort and efficiency.

From homeless, anonymous guy to TV star, at least for one day. Alexandre has appeared on French media , sitting on a bridge in Lyon, while inviting passers-by to give him money by scanning a QR Code with their smartphone .

Imagine visiting a hi-tech museum and being guided by an AI robot. No, you are not experiencing a remake of the “2001.

It’s all about connection. This is the key to making a city “smart”, say the smart people working on the subject. And by “connection”, they mean not only the technological kind but especially the human one.

Each year over 3.5 million tourists from all over the world visit Pompeii to admire the ruins left by the eruption of the Vesuvius that, in 79 AD, engulfed it together with the nearby city of Herculaneum.

In the city, the famous Cabanyal district which had been home to a local fishing community for a long time, has recently been transformed into a testing ground for numerous energy efficiency techniques.

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.

Cities, with their concentration of services, economic opportunity, mobility and social interaction, have proved endlessly attractive to humans.

Today´s liberalised markets are focused on short-term return on capital, but energy infrastructure planning should be driven by the objective of climate protection.

Door locks that open with fingerprints, networked security cameras, smart light bulbs, smart washing machines: technology is transforming our homes, turning the tech dreams of yesterday into the reality of today.

Building with wood, straw, and hemp. Biobased materials are seeing ever more use in the construction sector, which needs to become more sustainable as it is one of the major sources of soil, air and water pollution.

Thirty-one apartment buildings comprising 140,000 m 2 of floor space: Europe’s most ambitious energy-saving renovation project is transforming Torrelago, a residential district of Valladolid in central Spain.

  In the suburbs of Valladolid, a city in central Spain, a district is at the forefront of Europe's energy transition.

Spain is known as a land of sun and heat. But even here there are regions that have to face icy winter temperatures. In Valladolid , in the north of the country, many of the almost 300,000 inhabitants are in poorly isolated buildings built in the 1960s.

From 21 to 25  May the EU Green Week is exploring ways to accelerate sustainable urban transformation.

Local governments in Europe are notoriously risk averse, city council officials and industry leaders won’t hesitate to tell you.

Bristol is at the forefront of high-tech innovation in the UK, named European green capital in 2015. But it is also the second least affordable major British city housing-wise only after London.

When temperatures are low, the temptation to take long, scalding showers and turn electric heaters to the maximum is high. And not knowing how much energy we spend, when we unthinkingly do these activities, makes it difficult for us to decrease our consumption.

Home sweet home. Houses are supposed to be our nest, a shelter from the world outside. But how healthy are European homes? Nowadays most of our time is spent indoors, often at home, one reason being the current shift to “desk jobs”.

As air pollution is largely considered to be an outdoor problem, people are little aware of indoor contaminants . The World Health Organisation estimated that each year 4.3 million people die of exposure to household pollutants.