Nantes: a 360 ° view rather than carbon neutrality – La


"Nantes zero emission city? This was one of the first questions submitted to the debate by the people of Nantes during the third meeting of Labo258, the participatory and collaborative unit opened by Johanna Rolland, Mayor of Nantes and President of Metropolis in the perspective of the Municipalities of 2020. " The question of a post-carbon society is a real topic. The problem is that the goal of carbon neutrality is difficult to measure. Today there is no strict definition or a common methodology. Thus, in the metropolis, we have opted for extremely ambitious and offensive choices, with concrete, measurable, quantifiable and verifiable objectives. "The president of Nantes Métropole says, who will present to the metropolitan council on December 7th, the adoption of the new Territorial and Territorial Energy Plan (PCAET) and the local urban planning plan (plum). calibrated to achieve clear objectives: reduce greenhouse gas emissions per capita by 50% by 2030, halve energy consumption and increase renewable energy production to 20%% of energy consumption.

Midway goals

" Now it's a question of going further and accelerating. You must know how to get out of the experimentation. Today, our problem is clearly that of a change of scale "Warn the elected Nantes for whom" the main strength of the city is to have tangible results to put on the table "For this reason, it is based on surveys conducted by the Air Pays de la Loire association, an ant that collects data provided by hundreds of structures, organizations or companies (Atlanbois, Enedis, GRDF, the great seaport of Nantes- Saint-Nazaire …) highlighted in the Basemis report This inventory details by sector (agriculture, industry, transport, construction, energy …), energy consumption, greenhouse gas (GHG) emissions and major air pollutants.

First indication: while the metropolitan population grew by almost 20% between 2003 and 2016 (637,000 inhabitants), energy consumption increased by only 3% and greenhouse gas emissions decreased by 5%. Given the demographic trend, the ratio with the number of inhabitants reduces energy consumption to -13% and greenhouse gas emissions (GHG) to -20%. In line with the 50% target wanted by 2030. " But 2030 is in twelve years. So we have to send everyone "Says Julie Laernos (ELVV) vice president of Nantes Métropole This was the goal of the Great Energy Transition Debate organized two years ago with the participation of 53,000 natives, 11,000 contributors, 270 organizations, 80 events … and a perspective through a roadmap of 33 actions, the key principles, the implementation of open governance and objectives: 100 million euro to renovate housing, 1 billion for transport, sustainable mobility and intermodality by 2030 … A program that the city is making.

Efforts begin to pay

Thanks to the two main transport and housing sectors, which account for 70% of energy consumption and greenhouse gas emissions, efforts are starting to bear fruit. In light of these two indicators, the impact of road transport remains relatively stable between 2003 and 2016, despite an increase in population and, therefore, in travel.

" This results from the technological improvement of the vehicle fleet and the measures implemented by Nantes Métropole ", Takes note of the Basemis report: Strong growth since 2003, the real estate portfolio shows a decline in per capita consumption." The energy efficiency of buildings is also visible "The inventory says: it is perhaps through the type of energy used that the behavior change is more marked with a significant decrease in oil products in favor of electricity, while Nantes remains, in absolute value, the municipality of the most eminent GHG metropolis, its emissions per inhabitant have fallen by 25% and are lower than the average agglomeration, where the share of renewable energy has increased by 73%.% since 2008.

The scenery in the names is in Giec's fingernails … yes or no?

" These data reinforce our strategy. The increase in carbon sinks through the introduction of nature into the city is underway. The plum will allow us to reduce the consumption of natural and forest areas by 50% compared to 2004-2014, urban forests must increase from 12 to 36 hectares by 2020, diesel vehicles for public transport will be removed in the coming years. We have just implemented a territorial food project to promote short circuits, the new project of the railway station will include 60% of green space, the roof of 32.000 square meters of the national market will be entirely covered by photovoltaic … We are in a strategy global and transversal "Says the president of Metropolis, labeled Cit 'ergie in 2015." This allows us to have an external look and a European reference to our procedures. "

Is the Nantes scenario in line with Giec's objectives? " We are clearly there, says Johanna Rolland. Also adding a dimension that involves touching the diversity of the people of Nantes, even the most modest. "

For Julien Dossier, founder of Quattro-libri, a low-carbon strategic research and consulting firm, co-author of the "Paris, towards CO2 neutrality in 2050" relationship, the account is not there. " Naturally, Nantes has historically put the energy transition into its local culture. Symbolizing the withdrawal of cars in the city, encourages cycling, has not usurped its green capital title. If it hosted the Ecocity or Climate Chance summits, it is not a coincidence, but the transition to carbon neutrality requires a revision of another nature and another vision, with a retrograning over 31 years. The trajectory towards carbon neutrality, necessary to achieve Giec's objectives, requires a profound rethinking of the modes of consumption, supply, travel and construction. In Nantes, the abandonment of the NNDL airport is an opportunity to seize. Other sectors, like tourism, sport – we are talking about building a new stadium rather than renewing the old – or economic development, are not yet at the service of carbon neutrality. However, it is up to cities and city networks to evaluate industrial investment strategies and to push states to adopt more ambitious national standards. "

Would prefer a green line designed by Le Voyage à Nantes that connects contemporary works of art in the city, but also places where changes in uses towards carbon neutrality take place. Pedagogy for culture.

By Frédéric Thual,
Correspondent of Pays de la Loire for The tribune


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