In pics: Former coal hub Nottingham aims to become Britain's first net zero city

Nottingham is surrounded by the remains of coal pits that were the backbone of the area's economy until the 1980s.

The final mine shaft closed in 2015 and Ratcliffe-on-Soar, which stands a few miles outside the city, will be Britain's last working coal power station when it shuts in 2024.

In recent decades, the city has reinvented itself as a leader on green policies.

In 2020, Nottingham City Council launched a plan to cut or offset all the carbon produced within the city in less than a decade, in a sprint that will require it to slash emissions by more than 20 per cent a year.

"Nottingham's ambition is noble but the city will never be able to fulfil its carbon-cutting potential unless the government steps up and provides far more support", said Ed Matthew, campaign director at climate change think-tank E3G.

Home to over half the world's population and rising, cities create 75% of global CO2 emissions, notably from transport and buildings, the UN Environment Programme (UNEP) estimates.

But they can also offer solutions, as their density brings efficiency, be it in transport networks or apartment blocks.

"There's this sort of vision that cities are bad for the environment" said Valentine Quinio of the Centre for Cities, a British think-tank working to improve the economies of urban centres.

"But actually the person living in the city has a lower carbon footprint than someone outside a city."

To cut emissions faster, Nottingham has a host of micro schemes planned, from introducing more vegetarian options in schools to persuading residents to cut down on car rides and eat less meat.

It has held workshops on its plans that invite residents to share their views and also give them information on how to cut their own footprint.

"If we want to make a difference, we need all sectors of society to be involved," said Megan Shore, a programmes manager at charity Ignite! which has run some of the sessions, organised in tandem with local organisations and charities.

Attendees say they want more community gardening and less pointless packaging, said Shore, calling the sessions positively practical rather than laden with "doom and gloom".

Residents can even win prizes via a "Green Rewards" app, released in collaboration with the city's universities, if they cut their carbon footprint with actions such as choosing bikes over cars or taking shorter showers.

About 1,000 people have registered for the app across Nottinghamshire since it launched in October, with residents supportive if also somewhat sceptical.

Upendo Patterson, 22, a recent law graduate, said she was "looking forward to a greener Nottingham" but was "unsure how they plan to get there and how much of the responsibility will be placed on Nottingham's residents."

Councillor Longford said Nottingham had little choice but to try to build a brighter future.

"We need to work together to make a change in the way we live and the way we work for future generations," she said.

"I have a young granddaughter, and I don't want her to live in a world of chaos and pressure."