We are facing a global biodiversity crisis and freshwater biodiversity is declining more rapidly than either terrestrial or marine biodiversity. One in ten freshwater and wetland species in England are threatened with extinction and two thirds of existing species are in decline. Regulatory data suggest that chemical pollution from wastewater discharges, transport, urban environments, agriculture and mining all contribute to failures against existing quality standards. The Environmental Audit Committee recently summarised the state of water quality as: "rivers in England are in a mess. A 'chemical cocktail' of sewage, agricultural waste, and plastic is polluting the waters of many of the country's rivers". However, these assessments of the impacts of chemicals on UK surface waters, are unlikely to reflect real impacts as they: focus on a small proportion of chemicals in use; take a single compound-single endpoint approach; ignore the combined effects of chemicals, water quality parameters and species interactions; and do not recognise that the sensitivity of ecological communities can vary in space and time. If we are to halt biodiversity loss in UK rivers while continuing to realise the societal benefits of chemicals, we urgently need more effective methods for assessing, predicting and managing the impacts of chemicals both now and in the future. We aim to deliver and demonstrate a new assessment framework that accounts for the known variability in the physico-chemical and ecological characteristics of a catchment and determines the combined impacts of mixtures of chemicals, bioavailability modifiers and nutrients on the structure and functioning of species assemblages at high spatial resolution. The framework will be developed not only to assess current chemical impacts but also future impacts resulting from changes driven by global megatrends such as climate change, urbanisation and population growth. Using 350 sites in nine Yorkshire river catchments covering different land-uses and pollution pressures, we will develop, test and demonstrate our framework by: 1. prioritising chemicals emitted to UK freshwaters to identify those chemicals in catchments that are driving impacts; 2. characterising current (2002-2022) and future (2061-2080) chemical exposure and general water quality parameter profiles in UK catchments; 3. estimating the effects of chemicals on UK-relevant species under different water quality conditions; 4. predicting the current and future combined effects of chemical mixtures, bioavailability modifiers and nutrients on biodiversity and ecosystem function; and 5. applying the findings to identify interventions to mitigate the impacts of chemicals on biodiversity now and under future climate and catchment change. The understanding and predictive modelling tools developed during this project will inform the development of better plans for adaptation and mitigation of risks associated with declining water quality now and in the future. By working closely with our partners, who include key representatives from the policy (JNCC), regulatory (HSE), major industry (Unilever, UKWIR, Network Rail) and NGO (National Trust, Rivers Trust) sectors, we will provide policy makers with the knowledge and frameworks to realise a paradigm shift towards chemical risk assessment that will protect biodiversity and key environmental functions in areas where they are vulnerable. Regulators and industry alike will be able to focus future investments and effort on scenarios where harm is most likely/actually occurring. Manufacturers of chemicals will be in a better position to produce chemicals that are beneficial to society but which do not negatively impact the natural environment and the ecosystem services that it provides. Only by taking an integrative and system-wide approach adopted in this project will we be able to deliver the Environment Act's aspiration to "reverse the decline in species abundance by the end of 2030".

London and the South-East is the economic 'powerhouse' of England contributing 40% of GDP. Currently there is a shortage of housing, particularly affordable homes, and 50,000 new homes per year are planned for London to 2036. The growing population of London and its planned housing require water to be supplied and flooding to be reduced as far as possible. However, the region is vulnerable to water shortages (droughts) and floods. In the spring of 2012 London was facing potentially its worst drought, with concerns whether Affinity Water could provide sufficient water for some Olympic events. By contrast, the prolonged rainfall that then fell over the summer caused localised flooding and the Thames barrier being closed twice. This swing, over half a year, from extreme shortage of water to excess highlights the major challenge London faces to manage the water environment. This challenge is likely to worsen with climate change alongside the expected economic growth of London and associated increase in population. It also shows how droughts and flooding are two ends of a hydrological spectrum, whose political oversight, i.e. governance, needs to be managed was a whole. It is this need for integrated, collaborative and appropriate management that lies at the heart of CAMELLIA. Focusing on London, CAMELLIA will bring together environmental, engineering, urban planning and socio-economic experts with governmental and planning authorities, industry, developers and citizens to provide solutions that will enable required housing growth in London whilst sustainably managing water and environment in the city. CAMELLIA will be led by Imperial College London, working in collaboration with researchers at University College London, the University of Oxford, and the British Geological Survey. The programme is supported by communities, policymakers and industry including: local and national government, environmental regulators, water companies, housing associations and developers, environmental charities and trusts. Ultimately, the programme aims to transform collaborative water management to support the provision of lower cost and better performing water infrastructure in the context of significant housing development, whilst improving people's local environments and their quality of life. The relationships between the natural environment and urban water infrastructure are highly complex, comprised of ecological, hydrological, economic, technical, political and social elements. It is vital that policy and management are informed by the latest scientific understanding of hydrological and ecological systems. However, for this knowledge to make a change and have an impact, it needs to be positioned within wider socio-technical and economic systems. CAMELLIA will provide a systems framework to translate Natural Environmental Research Council-funded science into decision-making. Enabling a range of organisations and people to contribute to, and apply systems-thinking and co-designed tools to create a paradigm shift in integrated water management and governance underpins CAMELLIA. This will achieve the goal of real stakeholder engagement in water management decisions and provide a template, not just for London's growth, but for other cities, regions and communities both nationally and globally. The proposed work programme consists of four work packages which address 4 key questions, namely: How to understand the system?; How to model the integrated system?; How to analyse that system?; How to apply this systems approach to create impact? To help focus these questions, four London based case studies are being used, each reflecting a key issue: Southwark (urban renewal); Thamesmead (housing development); Mogden (water infrastructure regeneration); Enfield (Flood risk and water quality). From these, an integrated systems model will be applied to the entire city in order to help guide policy, planning and water management decisions.

Peatlands store more carbon than any other terrestrial ecosystem, both in the UK and globally. As a result of human disturbance they are rapidly losing this carbon to the atmosphere, contributing significantly to global greenhouse gas emissions and climate change. We propose to turn this problem into a solution, by re-establishing and augmenting the unique natural capacity of peatlands to remove CO2 from the atmosphere and to store it securely for millennia. We will do this by working with natural processes to recreate, and where possible enhance, the environmental conditions that lead to peat formation, in both lowland and upland Britain. At the same time, we will optimise conditions to avoid emissions of methane and nitrous oxide that could offset the benefits of CO2 removal; develop innovative cropping and management systems to augment rates of CO2 uptake; evaluate whether we can further increase peat carbon accumulation through the formation and addition of biomass and biochar; and develop new economic models to support greenhouse gas removal by peatlands as part of profitable and sustainable farming and land management systems. Implementation of these new approaches to the 2.3 million hectares of degraded upland and lowland peat in the UK has the potential to remove significant quantities of greenhouse gases from the atmosphere, to secure carbon securely and permanently within a productive, biodiverse and self-sustaining ecosystem, and thereby to help the UK to achieve its ambition of having net zero greenhouse gas emissions by 2050.

By the middle of this century, two thirds of the world's population will be urban - equivalent to around 6.3 billion people. Mismanagement of these urban areas will adversely affect the health and well-being (i.e. how people experience their lives and flourish) of the population, and lead to social and environmental injustice. It has long been recognised that good quality cultural, social, built and natural environments within cities provide benefits in terms of health, well-being and equity of urban residents. Conversely, poor quality environments negatively affect the health and well-being of citizens and have negative economic consequences. With increasing urbanisation and changes in climate, the built, cultural, social and natural environments within cities will come under further pressure. While the relationships between selected environment quality parameters, such as noise and air pollution and health, have been well characterised, relatively little is known about the relationship between other quality measures, or endpoints, of economic and societal well-being and health. A major reason for this limited understanding is that while much data on city environments exist, this is fragmented across numerous data owners, is not joined up or at suitable granularity. As these existing datasets have been collected for other reasons, they are not always in a form where they are useful for a wide variety of purposes or for future needs. Data on some important parameters simply does not yet exist. Additionally, specialists in the different disciplines needed to tackle these complex issues often work in isolation. By bringing data together, breaking down barriers across research disciplines and exploiting and developing new monitoring, modelling and analytical technologies (e.g. wireless sensing networks, wearable devices, drones, crowdsourcing, 3D models of cities and virtual reality), it should be possible to provide a holistic analysis of the quality of the environment with a city that can be used by many different stakeholders (e.g. researchers, policy makers, planners, businesses and the public) to address their needs. This holistic analysis will then provide us with a better understanding of how to manage city environments and will provide long-term benefits to citizens and the economy. The York City Environment Observatory (YCEO) initiative will address this major knowledge gap by providing a framework, tools and conceptual models at the urban scale that can be rolled-out to assist with governance of environments in York and other cities in the UK and around the world. In this diagnostic phase project, experts from a diverse range of sectors and disciplines, will work together in a holistic way to design and lay the groundwork for establishing the YCEO. The consortium will work with a range of stakeholders and look to the past, present and future in trying to diagnose and predict environmental issues for York and their associated human health and well-being and economic impacts. We will build on York's strong track record in open data and combine data and models in order to do this. This diagnostic project will allow us to develop a prototype design for the YCEO, to be implemented within the next five years and a roadmap for achieving this. The YCEO will be designed to provide the evidence-base for making decisions on how best to manage and enhance the social, cultural, built and natural environment across city systems now and into the future, and in this way, improve the health, well-being and equity of citizens and the economy of the city. The YCEO will also aid local, national and international stakeholders (including planners, businesses, residents and community groups) to come up with low cost and innovative solutions to a range of problems identified as part of this diagnostic phase of the Urban Living Partnership.

Land-use and agriculture are responsible for around one quarter of all human greenhouse gas (GHG) emissions. While some of the activities that contribute to these emissions, such as deforestation, are readily observable, others are not. It is now recognised that freshwater ecosystems are active components of the global carbon cycle; rivers and lakes process the organic matter and nutrients they receive from their catchments, emit carbon dioxide (CO2) and methane to the atmosphere, sequester CO2 through aquatic primary production, and bury carbon in their sediments. Human activities such as nutrient and organic matter pollution from agriculture and urban wastewater, modification of drainage networks, and the widespread creation of new water bodies, from farm ponds to hydro-electric and water supply reservoirs, have greatly modified natural aquatic biogeochemical processes. In some inland waters, this has led to large GHG emissions to the atmosphere. However these emissions are highly variable in time and space, occur via a range of pathways, and are consequently exceptionally hard to measure on the temporal and spatial scales required. Advances in technology, including high-frequency monitoring systems, autonomous boat-mounted sensors and novel, low-cost automated systems that can be operated remotely across multiple locations, now offer the potential to capture these important but poorly understood emissions. In the GHG-Aqua project we will establish an integrated, UK-wide system for measuring aquatic GHG emissions, combining a core of highly instrumented 'Sentinel' sites with a distributed, community-run network of low-cost sensor systems deployed across UK inland waters to measure emissions from rivers, lakes, ponds, canals and reservoirs across gradients of human disturbance. A mobile instrument suite will enable detailed campaign-based assessment of vertical and spatial variations in fluxes and underlying processes. This globally unique and highly integrated measurement system will transform our capability to quantify aquatic GHG emissions from inland waters. With the support of a large community of researchers it will help to make the UK a world-leader in the field, and will facilitate future national and international scientific research to understand the role of natural and constructed waterbodies as active zones of carbon cycling, and sources and sinks for GHGs. We will work with government to include these fluxes in the UK's national emissions inventory; with the water industry to support their operational climate change mitigation targets; and with charities, agencies and others engaged in protecting and restoring freshwater environments to ensure that the climate change mitigation benefits of their activities can be captured, reported and sustained through effectively targeted investment.