Increasing resistance to herbicides, coupled with a lack of new types of herbicides, has the potential to reduce crop yields. The UK Government’s commitment to increase yields over the next 25 years will require the development of alternative crop protection methods. This POSTnote outlines the challenges of herbicide resistance and reviews the possible approaches to long-term weed control strategies.

Transport is a key driver of economic growth. It links people to their workplaces and connects businesses. It also affects health, the environment and societal wellbeing. This POSTnote looks at why transport is changing, outlines current trends across and within transport sectors and considers the planning of transport networks.

Biodiversity supports the ecosystem services humans rely on for well-being and economic resources. Areas that have had an audit can make more effective use of ecological data to meet planning and conservation objectives for biodiversity. This POSTnote summarises the data sources used and the advantages of the audit approach for addressing biodiversity loss.

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    Agriculture contributes 9% of the UK’s greenhouse-gas (GHG) emissions burden and 10-12% globally. Although there is a long-term declining trend from UK agriculture, the sector may account for a larger share of overall emissions in the future as other sectors reduce emissions. This POSTnote focuses on reducing GHG emissions from growing and storing arable and horticultural crops.

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    Changing weather patterns have made structural defences less effective at managing flooding. An approach that employs a range of natural flood management measures across a river catchment is likely to reduce the probability of flooding and pressure on structural defences. This POSTnote describes the measures and the challenges of implementing them over large catchments.

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    Insects play a critical role in ecosystems, but can also cause economic and social harm by transmitting diseases to humans and livestock, and damaging crops. Genetically modified (GM) insects could be used alongside other approaches to mitigate harms. This POSTnote summarises possible benefits, risks and uncertainties associated with their deployment.

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    Water pollution regulation is devolved in the UK. Surface, coastal and ground waters in England suffer from significant pollution problems: 78% of surface and groundwater bodies fail to meet the ‘good’ ecological status prescribed by the EU Water Frameworks Directive. Pollution increases water treatment costs and adversely affects wildlife. Compared to treatment, preventing water pollution at source can have a cost-benefit ratio as high as 1:65. This POSTnote describes the contribution of agriculture to water pollution, and measures that can be taken to reduce it.

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    Short lived Climate Pollutants (SLCPs) include black carbon, methane, hydrofluorocarbons (HFCs) and ground level ozone. Although they have a shorter residence time in the atmosphere than CO2, from a few days to a few decades, they contribute to near term climate change. This POSTnote summarises options for mitigating SLCP concentrations and the benefits and challenges of doing so.

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    World food security is dependent on phosphate fertilisers manufactured from finite deposits of phosphate ore. The majority of remaining reserves are restricted to a limited number of countries raising geopolitical risks. This POSTnote describes the uses of phosphate and summarises ways in which dependence on mineral reserves could be reduced.

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    The UNFCCC REDD+ scheme aims to promote sustainable forest management in developing countries in order to reduce carbon dioxide emissions. Developed countries are expected to provide finance of approximately $20bn per year from 2020. This POSTnote summarises the extent to which REDD+ could contribute to meeting international climate targets, challenges to its implementation and technologies for tracking its performance

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    Environmental citizen science traditionally involves members of the public submitting sightings of wildlife to NGOs or records centres, but emerging technologies have recently broadened its use to all kinds of environmental data. This POSTnote summarises different types of citizen science projects, policy-relevant applications and the benefits and challenges of volunteer collected data.

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    Smart meters record energy and water usage and improve how this information is relayed to both consumer and suppliers. The Government plans to roll-out smart meters of electricity and gas to all households in Great Britain by the end of 2020. This POSTnote examines the potential benefits and risks associated with smart metering of both water and energy, and the challenges for the energy smart metering roll-out.

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    Ancient woodlands are irreplaceable features of our landscapes that can be high in biodiversity or cultural value. This POSTnote summarises the challenges of conserving the biodiversity and cultural heritage of these sites to provide social and economic benefits, while still meeting the development needs of society.

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    Sources of electricity that exhibit uncontrolled increases or decreases in output are often referred to as intermittent. This POSTnote examines the effect of wind, solar, wave and tidal intermittency on electricity prices, carbon dioxide emissions and the provision of electricity to meet demand. The note also describes measures to manage intermittency.