From the frosty reaches of Umeå in eastern Sweden to the rolling hills of San Sebastian in Spain’s Basque Country, European cities have one refrain on their minds as the cold sets in: winter is coming and homes must be heated in a way that allows the EU to reach its goal of reducing energy consumption by 20% by the year 2020 .

Energy consumption in the construction sector is a key issue in the fight against climate change. It is often approached when planning new buildings, but there is little tendency to renovate the existing stock .

Thousands of kilometres of increasingly sophisticated and cutting-edge transmission lines, in other words supergrids , are on the EU agenda. Projects for high voltage links between countries are already being implemented.

Over the last few decades the energy landscape has been changing drastically in Europe. An increasing amount of electricity is now generated from renewable sources, such as solar and wind energy.

Despite increasing talk about renewable energy, many people remain far removed from what’s going on. To tackle this, various projects have been developed over the years helping users to better understand and use green energy sources.

This year’s EU Green Week is clear in its focus: “green jobs for a greener future.” It’s highlighting how environmental policies are helping to create new work opportunities and a demand for new types of competences.

The 43-story Strata tower in London was one of the first buildings in the world to incorporate wind turbines into its structure. It has three small turbines – each with a rated capacity of 19 kilowatt hours – built into its roof.

The bakery industry is a large supplier of jobs and revenue, but on the other side of the coin it is hungry for energy.

Smart buildings appear to respond to a range of energy challenges found in Europe today. Improved efficiency would help consumers reduce income spent on energy consumption, reduce greenhouse emissions and also help EU countries meet the goals of the 2030 energy strategy .

The pioneering city of Stuttgart, Germany, was one the first to apply an innovative financing scheme back in 1995 and since then it has been bearing its fruit: energy-efficiency funding has reduced the city’s CO 2 emissions by tens of thousands of tonnes.

Buildings account for 36% of CO 2 emissions in Europe, and energy consumption in this sector has increased in recent decades.

Today, one of the new challenges for the construction industry is the use of textiles, coming from the clothing and footwear industries.

Do young people know what a smart city is? Do they care about saving energy and preserving the Earth’s resources? “Rooting sustainability starts on the benches of schools,” affirmed UNESCO director-general Irina Bokova at the recent UN Climate Change Conference ( COP22 ) in Marrakech, Morocco.

Part of the issue with small-scale, home-based renewable energy systems is that initial setup costs can be high. This puts such installations out of reach for some sectors of society, even if they could benefit financial in the long run with lower household bills.

As more and more cities launch projects to become smart, a substantial need is emerging: the ability to share the various models across the world so that they can be replicated anywhere.

Suburbs are often spaces of poverty, unemployment and urban decay. But now many peripheral areas are becoming laboratories of innovation , hosting initiatives for a sustainable future.

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 .

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.

All too often, conversations on renewable energy meander toward the same end: green technology is a nice thing, though it has to become economically viable before widespread adoption becomes the norm. ...