To live up to their climate pledge under the Paris agreement, EU
lawmakers must ensure all 250 million existing as well as all new buildings in
the EU become nearly zero greenhouse gas emitters. In a new report, experts
nominated by EASAC’s member science academies call for far-reaching policy
action. “Policymakers have long focused on creating energy-efficient buildings
that reduce the need for heating and air conditioning or generate renewable
energy on site. But the energy used for operating buildings is only part of the
story. We must urgently broaden the scope and look at emissions embodied in
construction materials and methods – both for new buildings and building
renovation.”, says William Gillett, EASAC’s Energy Programme Director.
Currently,
between 1 and 1.5% of the European building stock is being renovated annually.
“To meet the goals of the Paris agreement, that rate should be two or even
three times higher”, points out Gillett. “But more importantly, we need to
factor in the massive emissions of the construction industry and supply chain,
when calculating the climate impact of buildings. Renovating a building to
reduce its energy consumption makes little sense if there is no control of the
carbon-intensive materials and components used for the renovation, and if these
are transported over long distances.”
So far, EU
policies have centered on the concept of ‘Nearly-zero energy buildings’ with a
focus on reducing the consumption of energy used to provide comfort to building
occupants. According to EASAC, this notion is outdated: “Instead, the indicator
to be used now for assessing the climate impact of a new building or renovation
should be cumulative greenhouse gas emissions, including embodied emissions
produced by the building works and operating emissions produced by the building
in the years following those works. As there are only about 10 years left
before the door closes for limiting global warming to less than 1.5 oC,
there is an urgent need over this period to limit the creation of embodied
greenhouse gas emissions when renovating to produce nearly zero emission
buildings”
Buildings
should be designed to be disassembled and recycled at end of their lifetime
The report
points out that most of the built environment is still designed using a linear
take-make-consume-dispose approach. Transitioning to a circular economy would
not only allow to reduce resource consumption and carbon footprint, but also
address the waste problem. “Circularity has many facets”, explains Prof. Brian
Norton, Co-chair of EASAC’s Working Group. “Many building materials can be
reused, recycled and recovered. To start with, buildings and their components
should be designed to be easily disassembled at the end of their use.”
Renovating
existing buildings must be at the heart of the EU’s strategy, the scientists
argue. “It’s important to consider the re-use of existing buildings rather than
replacing existing buildings with new ones,” says Norton. “There is a lot of
embodied carbon in a building structure, especially in the concrete and steel.
With today’s technologies and digitalized processes, renovating has become a
lot easier and sustainable. We have to stop the current practice of knocking
down structures to rebuild from scratch.”
The report also argues that legislation must put a limit of embodied carbon per
m2 of floor area that is brought into a building when it is constructed or
renovated.
Climate
neutrality by 2050 requires renovating more than 90.000 homes – per week
In 2020, the
European Commission presented its ‘Renovation Wave’ strategy to boost energy
renovation of buildings in the EU. It intends to revise the Energy
Performance of Buildings Directive as one of the cornerstones of that strategy.
“While a Directive on the energy performance of buildings has been in place
since 2002, recast in 2010 and revised in 2018, the results so far have been
underwhelming”, says Gillett.
The
challenge, however, is huge. „75% of the buildings Europeans live in are
estimated to have a poor energy performance. To renovate them would require 146
million renovations in only 30 years. Member States’ current efforts are not
sufficient,” explains Norton. “Achieving climate neutrality implies we need to
renovate more than 90.000 homes per week across the EU – in itself an enormous
challenge.”
Buildings
are an emission source that municipalities have a lot of control over
While
the authors address their policy recommendations primarily to the European
Union, they also make clear that cities have a big role to play. “Municipal
Councils and urban planners have tremendous influence on procurement
specifications. They can stimulate the renovation and construction of nearly
zero GHG emission neighbourhoods with integrated energy and transport systems
and adequate green spaces. They can facilitate up-grading existing district
heating and cooling systems or build new ones with optimised use of renewable
energy, including PV, heat pumps, solar and geothermal heating, waste heat and
natural cooling. And they are particularly well-placed to oversee renovations
of social housing and subsidise the deep renovation of private housing where
necessary to reduce energy poverty.” says Norton.
EASAC’s
messages to policymakers:
- Phase out fossil fuels by 2030, increase integrated supplies of decarbonised electricity and heat to buildings, industry and transport, and accelerate the deployment of carbon capture and storage.
- Use grants and incentives to trigger, leverage and de-risk private financing for deep energy related building renovations.
- Regulate levels of embodied GHG emissions in building materials and components, and promote recycled materials, re-used building components, and renovation instead of demolition.
- Refocus building regulations, certification schemes and incentives to deliver new and renovated buildings that operate with nearly zero GHG emissions.
- Promote health and wellbeing to double / triple rates of renovations that improve air quality, increase access to daylight, and avoid draughts and overheating as well as reducing GHG emissions.
- Champion public authorities and cities, facilitate and support their commitments to decarbonise buildings and reduce energy poverty.
- Expand and modernise the building industry to operate using circular business models with 3 million more jobs (including high quality jobs) to deliver new and renovated buildings with nearly zero GHG emissions
- Improve access for building owners and professionals to certified data on the embodied GHG emissions of building materials and components, and on the energy and GHG emission performance of new and renovated buildings
- Update EU legislation (EPBD, EED, RED, ETS, CPD, Taxonomy) using an integrated approach to phase out fossil fuels, increase renewable energy supplies and reduce cumulative GHG emissions from buildings
A public launch event during which this new
report will be presented will take place on Wednesday, 2 June 2021 at 12:00
CEST.
More information on this
webinar can be found here. For immediate
registration use this link.