We will develop a fully integrated environmental decision support tool for tropical perennial crops and deliver a full technical specification for inclusion into the online, and freely available Cool Farm Tool. The Cool Farm Tool is owned by the Cool Farm Alliance (CFA) who will partner on this project. It is a business-led initiative to assess and improve the sustainability of agriculture-based supply chains. It is funded via a membership model, with membership consisting of over 50 companies including for example major multinationals such as Unilever, PepsiCo, Heineken, Danone, Nestle, Marks and Spencer, and Tesco. Members pay to maintain the tool and deploy at scale in their supply chains but it is a core principle of the Alliance that the tool is and will always be free-to-use for farmers. The CFT itself is a science-based decision support tool designed for use by farmers at farm scale. It has benefitted from significant NERC Discovery and Innovation funding in the past and as a result includes a growing suite of metrics for crop and livestock systems in an expanding set of geographic locations (over 100 countries). Several case studies have shown the impact that has been derived using the tool, for example PepsiCo's "50-in-5" (http://pepsico.co.uk/live/story/celebrating-sustainable-farming) and egg production in North America resulting in a 25% reduction in the carbon footprint from primary production (Vetter et al 2018). Tropical perennial crops are of huge importance to global food supply chains and typically have high dependence on smallholder farmers in DAC countries where decision-support has been hindered less scientific evidence and the focus of researchers in temperate regions. This project build on numerous previous NERC and Wellcome Trust outputs and exploits established successful relationships between the project partners to ensure delivery. We will develop modules based around the existing CFT methods to allow a one-stop shop assessment tool for carbon and water footprinting and biodiversity impacts of farm practice in tropical perennials. Through partnership with the Cool Farm Alliance and the £5.4M Wellcome Trust funded SHEFS project we will ensure delivery of a tool which has practical value to farmers and supply chains. This business-led, science-based, and farmer-focused project will thereby provide robust metrics which will allow farmers to engage and demonstrate their positive actions for sustainability into international supply chains, and the businesses to identify good practices to embed in their sustainable sourcing strategies. The possibility to combine, in a single decision support tool, the multiple impacts of farm practices is attractive for many reasons, not least being that it will reduce the current burden on farmers to conduct multiple assessments of dubious value on multiple impacts for multiple buyers.

Business and agricultural drivers focussing on sustainability, coupled with UK policy focus in these areas have led to the increasing demand for the food and drink sector to manage its own environmental impacts. Industry-led methods such as ISO standards and PAS2050 have been available for some time to assess supply chains and products, but frequently lack the precision regarding the sensitivity to local variables and farm management practices to yield reliable information about how such impacts can be managed on the farm. Recently, the Cool Farm Alliance (a UK based CIC) has been formed as a cross-sector organisation to develop and manage a "farmer friendly" GHG calculator called the Cool Farm Tool. It has benefitted from significant NERC funding in the past and as a result of this is recognised as the de facto practical tool for farm gate GHG assessments. Examples of its application to drive changes in the supply chains of global businesses include PepsiCo (https://www.2degreesnetwork.com/groups/2degrees-community/resources/cutting-carbon-farm/) or more generally at www.coolfarmtool.org. The Cool Farm Tool won the 2015 Oxford Farming Conference "Practice with Science" award and has been shortlisted for the Times Higher Education Awards in two categories. The above demonstrate the applicability of the Cool Farm Tool to annual field crop and livestock systems. However, key processes relating to perennial production systems in the Cool Farm Tool are somewhat lacking, in particular in biomass carbon storage, soil carbon storage in perennials, and post-harvest processing. In the scientific studies to date, these components have been identified as being critical in deciding the GHG balance of crop production. Representation of perennial cropping systems will provide the necessary framework to integrate bioenergy crops in the Cool Farm Tool. Renewable energy, and bioenergy as part of this, is topical and of increasing importance to policy and industry because of its potential to support UK and global needs for low carbon and secure energy. As such, adding capability for such systems in the CFT will open new markets for the CFA and enable the addition of significant NERC research. There have been many research activities in recent years to conduct such assessments with several key studies funded by NERC, and in which the University of Aberdeen has participated. In addition, there are also several businesses in the energy sector specifically focussed on bioenergy (e.g. Terravesta, Rokwood) and it is part of the energy portfolio of major energy companies such as BP and Shell, and electricity generators such as EDF, E-ON, Drax, and Vattenfall (via ETI; Milner et al., 2015). In this project we will work closely with the Cool Farm Alliance and food and drink and bioenergy industries to add these necessary functionalities to the Cool Farm Tool. The inclusion of the above will ensure that the assessment of agricultural raw materials destined for food, feed, and energy markets can be performed in a consistent manner to enable fair cross-comparison and benchmarking. It will have the additional benefit of serving farmers and different industry sectors in assessing the relative benefits of crops and co-products which serve both end-markets (such as wheat, straw, and oilseed rape for bioethanol and bioenergy as alternatives to food or feed) and for agricultural waste, such as manure. This tool will aid farmers and land-owners to improve energy and input use efficiency and thus improve profitability. From the start of the project, we will establish a cross-sector working group to: 1. determine the key needs of end-users in the bioenergy domain 2. to identify the key science algorithms and methods to be employed 3. make the proposed developments "Cool Farm Tool ready". This will ensure that the project translates NERC-funded research into an industry endorsed product for immediate use by the relevant end-users.

Humans have massively altered flows of nitrogen on our planet, leading to both benefits for food production and multiple threats to the environment. There are few places on Earth more affected than South Asia, with levels of nitrogen pollution rapidly increasing. The result is a web of interlinked problems, as nitrogen losses from agriculture and from fossil fuel combustion cause air and water pollution. This damages human health, threatens biodiversity of forests and rivers, and leads to coastal and marine pollution that exacerbates the effects of climate change, such as by predisposing reefs to coral bleaching. Altogether, it is clear that nitrogen pollution is something we should be taking very seriously. The amazing thing is that so few people have heard of the problem. Everyone knows about climate change and carbon footprints, but how many people are aware that nitrogen pollution is just as significant? One reason for this is that scientists and policy makers have traditionally specialised. Different experts have focused on different parts of the nitrogen story, and few have the expertise to see how all the issues fit together. This challenge is taken up by a major new research hub established under the UK Global Challenge Research Fund. The "GCRF South Asian Nitrogen Hub" is a partnership that brings together 32 leading research organisations with project engagement partners from the UK and South Asia. All eight countries of the South Asia Co-operative Environment Programme (SACEP) are included. The hub includes research on how to improve nitrogen management in agriculture, saving money on fertilizers and making better use of manure, urine and natural nitrogen fixation processes. It highlights options for more profitable and cleaner farming for India, Pakistan, Bangladesh, Nepal, Afghanistan, Sri Lanka, Bhutan and the Maldives. At the same time, the hub considers how nitrogen pollution could be turned back to fertilizer, for example by capturing nitrogen oxide gas from factories and converting it into nitrate. The fact that all the SACEP countries are included is really important. It means that lessons can be shared on good experiences as well as on whether there are cultural, economic and environmental differences that prevent better management practices from being adopted. It is also important from the perspective of international diplomacy, and provides an example to demonstrate how working together on a common problem is in everyone's interest. It puts the focus on future cooperation for a healthier planet, rather than on the past. The South Asian case provides for some exciting scientific, social, cultural and economic research challenges. The first is simply to get all the researchers talking together and understanding each other. There are dozens of languages in South Asia, matching the challenge met when different research disciplines come together. This is where developing a shared language around nitrogen can really help. There are lots of nitrogen forms ranging from unreactive atmospheric nitrogen (N2), to the air pollutants ammonia (NH3) and nitrogen dioxide (NO2), to nitrate (NO3-) which contaminates watercourses, and nitrous oxide (N2O) which is a greenhouse gas. The impacts of each of these are being studied to provide a better understanding of how they all fit together. The result is an approach that aims to give a much more coherent picture of the nitrogen cycle in South Asia: What is stopping us from taking action, and what can be done about it. One of the big expectations is that the economic value of nitrogen will help. India alone spends around £6 billion per year subsidising fertilizer supply. It means that South Asian governments are strongly motivated to use nitrogen better. At which point research from the South Asian hub can provide guidance on where they might start.

Humans have massively altered flows of nitrogen on our planet, leading to both benefits for food production and multiple threats to the environment. There are few places on Earth more affected than South Asia, with levels of nitrogen pollution rapidly increasing. The result is a web of interlinked problems, as nitrogen losses from agriculture and from fossil fuel combustion cause air and water pollution. This damages human health, threatens biodiversity of forests and rivers, and leads to coastal and marine pollution that exacerbates the effects of climate change, such as by predisposing reefs to coral bleaching. Altogether, it is clear that nitrogen pollution is something we should be taking very seriously. The amazing thing is that so few people have heard of the problem. Everyone knows about climate change and carbon footprints, but how many people are aware that nitrogen pollution is just as significant? One reason for this is that scientists and policy makers have traditionally specialised. Different experts have focused on different parts of the nitrogen story, and few have the expertise to see how all the issues fit together. This challenge is taken up by a major new research hub established under the UK Global Challenge Research Fund. The "GCRF South Asian Nitrogen Hub" is a partnership that brings together 32 leading research organisations with project engagement partners from the UK and South Asia. All eight countries of the South Asia Co-operative Environment Programme (SACEP) are included. The hub includes research on how to improve nitrogen management in agriculture, saving money on fertilizers and making better use of manure, urine and natural nitrogen fixation processes. It highlights options for more profitable and cleaner farming for India, Pakistan, Bangladesh, Nepal, Afghanistan, Sri Lanka, Bhutan and the Maldives. At the same time, the hub considers how nitrogen pollution could be turned back to fertilizer, for example by capturing nitrogen oxide gas from factories and converting it into nitrate. The fact that all the SACEP countries are included is really important. It means that lessons can be shared on good experiences as well as on whether there are cultural, economic and environmental differences that prevent better management practices from being adopted. It is also important from the perspective of international diplomacy, and provides an example to demonstrate how working together on a common problem is in everyone's interest. It puts the focus on future cooperation for a healthier planet, rather than on the past. The South Asian case provides for some exciting scientific, social, cultural and economic research challenges. The first is simply to get all the researchers talking together and understanding each other. There are dozens of languages in South Asia, matching the challenge met when different research disciplines come together. This is where developing a shared language around nitrogen can really help. There are lots of nitrogen forms ranging from unreactive atmospheric nitrogen (N2), to the air pollutants ammonia (NH3) and nitrogen dioxide (NO2), to nitrate (NO3-) which contaminates watercourses, and nitrous oxide (N2O) which is a greenhouse gas. The impacts of each of these are being studied to provide a better understanding of how they all fit together. The result is an approach that aims to give a much more coherent picture of the nitrogen cycle in South Asia: What is stopping us from taking action, and what can be done about it. One of the big expectations is that the economic value of nitrogen will help. India alone spends around £6 billion per year subsidising fertilizer supply. It means that South Asian governments are strongly motivated to use nitrogen better. At which point research from the South Asian hub can provide guidance on where they might start.

The agri-food system, producing 23% of UK emissions, must play a key role in the UK's transition to net zero by 2050, and through leadership in innovation can support change globally. Our Network+ will build on existing and new partnerships across research and stakeholder communities to develop a shared agenda, robust research plans, and scope out future research and innovation. The Network will design and deliver high-reward feasibility projects to help catalyse rapid system transformation to ensure the agri-food system is sustainable and supports the UK's net zero goal, while enhancing biodiversity, maintaining ecosystem services, fostering livelihoods and supporting healthy consumption, and minimising the offshoring of environmental impacts overseas through trade. The radical scale of the net zero challenge requires an equally bold and ambitious approach to research and innovation, not least because of the agri-food and land system's unique potential as a carbon sink. Our title, Plausible Pathways, Practical and Open Science, recognises the agri-food system as a contested area in which a range of pathways are plausible. Success requires that new relationships between natural and social science, stakeholders including industry, government and citizens, be forged in which distributed expertise is actively harnessed to support sectoral transformation. We will use our breadth of expertise from basic research to application, policy and engagement to co-produce a trusted, well-evidenced, and practical set of routes, robust to changing future market, policy and social drivers, to evolve the agri-food system towards net zero and sustainability. Marshalling our many existing stakeholder links, we will review and evaluate current options and use Network funding to catalyse new partnerships through retreats, crucibles, workshops, online digital networking and scoping studies to develop system approaches to transformation, reframe the research agenda and undertake novel research projects. We will co-design productive and creative spaces that enable the research community to engage with a wide range of stakeholders and thought leaders through the following framework: 7 Co-Is who govern the Network but are not themselves eligible for funding; 9 Year-1 Champions (with new appointments after Year 1) dynamically forging new connections across research communities; 11 Advisory Board members tasked with challenging business-as-usual thinking; and regular liaison with other stakeholders.