We are delighted to be joined by Professor Mike Rogerson who will be discussing Forgotten carbon: understanding and managing how carbon moves and is stored beyond biomass.

We’re very much looking forward to welcoming Professor Mike Rogerson from Northumbria University to our November Café.

Mike says – The UK plans to reach net zero for carbon emissions by 2050.  This is not a simple thing to do by any means. We will have to reduce emissions as low as possible and are making progress towards that aim. Even after we have eliminated all the avoidable emissions we can, we will find a residual group of emissions which are really hard to prevent. This is on top of the fact the atmosphere already has too much carbon in it for global climate to be stable. We need to find some means to take carbon out of the atmosphere and put it somewhere inert. Trees are a popular solution, because they take carbon into their wood as they grow and can also put extra carbon into the soil below them. But we can only plant so many trees. Restoring our peatlands is also good direction to go in, not least because degraded peatlands actually emit quite a lot of carbon themselves. Restoring peatlands not only allows extra carbon to be stored in them, but actually turns this tap off. But there is only so much peat. Are there other natural carbon transporting and storing systems we can recruit to help us in the same way as the peatlands?

Many areas of the UK have a proud history of heavy industry: in Teesside, steelmaking was a big employer. While the CO2 produced by those years of manufacturing have contributed to the urgency of the need to manage our carbon budget, this is not the only thing they left behind. For the steel industry, large stockpiles of alkaline residue – slag, to you and me – are present at sites for former steelmaking. These are absorbing some of the carbon emitted in making them, sometimes back into an inert form which is stored in the soil. Managing and engineering this will speed the process up and allow us to put some of the carbon emitted in the past back into the earth. Similar things are possible in regions that previously had a cement industry. Transportation and storage of this ‘inorganic carbon’ is at risk of being forgotten as we focus on the ‘organic carbon’ stored in trees and peat which is awkward, because there is more inorganic than organic carbon being transported through our waterways. Inorganic carbon in your water is literally what makes limescale in your kettle. Stockton has moderately hard water (about 100ppm). Much of eastern and southern England has considerably more than that amount, with ‘very hard’ being defined as having more than 180ppm. That’s a lot of limescale! If we can alter the behaviour of that carbon, even only slightly, it will make a difference to meeting our ambitious aims.

So, can we manage the sources and transport of the forgotten inorganic carbon coming into our rivers and groundwater, like we are beginning to try with our peatlands? My team at Northumbria University in collaboration with colleagues at the Woodland Trust, Newcastle University and Texas A&M University are trying to find out.

About our speaker:

Mike Rogerson is currently Professor of Earth System Science at Northumbria University. He initially studied for a BSc in geology, followed by a MSc in petroleum geosciences at Imperial College, London. He started on the long arc to his current research work with a PhD in palaeoceanography at Southampton University. He is a life-long caver, with a fascination for how rocks that dissolve in water (limestones, mostly) form, and the curious things they do to the world, from providing some of the most extensively mined resources in the world to changing how water behaves on the surface and below it.

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