The persistent dry weather which has led to the current hosepipe ban in South East England is also threatening the future of one of Britain’s rarest amphibians, the natterjack toad.

With fewer than 50 breeding populations remaining in mainland Britain, the natterjack is highly vulnerable to the drying-out of the shallow coastal dune slacks it relies on as breeding habitat. Low rainfall for the past two years means that these wet hollows have begun disappearing before natterjack tadpoles have metamorphosed into toads, causing a significant drop in breeding success.

In response, Natural England has introduced a programme of water saving techniques and pond management across a number of its National Nature Reserves (NNRs), which support a large proportion of the remaining natterjack population. For example, at Saltfleetby Theddlethorpe Dunes NNR in Lincolnshire, staff have created captive pools in which water levels are controlled to allow tadpoles to mature before being they are allowed to escape into the surrounding dunes. Dr Pete Brotherton, Natural England’s Head of Biodiversity is optimistic about the success of the scheme saying ‘we are confident that the toad can bounce back if conditions prove wetter next year’.

Further afield, targeted conservation interventions to protect amphibians are also taking place in Central America. In this region, in addition to the threat of a changing climate, species of frog are being severely impacted by the spread of ‘chytrid’ – a virulent fungal disease. In some regions, the fungus is spreading at a rate of around 20 miles a year and can reduce frog populations by up to 90%. In response, scientists have started a programme of collecting healthy frogs from their forest habitats and transporting them to specially designed ‘arks’ to be held until ongoing research provides a solution to eradicate the fungus. Such a seemingly drastic response is partly due to the considerable potential value of amphibian diversity for human health. For example, a species of tree frog from Australia has been found to produce compounds that destroy HIV cells, whilst the phantasmal poison frog produces a painkiller 200 times more powerful than morphine. Already, the gastric-brooding frog – thought to offer a possible cure for peptic ulcers – has gone extinct.

In order to prevent the loss of further amphibian species with significant human, ecological and intrinsic value, such conservation efforts may need to be become more widely applied in the future.

For more on the natterjack toad, see Natural England’s press release on the subject. Further detail on amphibian conservation and the chytrid fungus can be found on the BBC news website.

The British Medical Journal is organising a briefing event for a small audience on the ‘Health and Security Risks of Climate Change’. This event, organised in partnership with the Climate and Health Council, will take place at BMA House on 17th October.

Advertising the event, Dr Fiona Godlee, Editor of the BMJ says: “Whilst the fiscal impacts of climate change are increasingly discussed, less attention is paid to its human impacts.

“These are increasingly recognised to be both imminent in their emergence, and grave in their consequence. Such is the opinion of the medical community, but also of the military and security establishment.

“Indeed, the direct health impacts of climate change will threaten security and promote conflict – factors which themselves threaten human health. Such issues were bluntly clarified in a recent editorial, published in the BMJ (British Medical Journal)”.

At the event, Dr Godlee explains, “these issues will be discussed in greater detail by experts in their fields – ranging from economists, policy makers, and influential members of the business community.”

To find out more or to apply for a place email climatechange@bmj.com before the 1st August 2011, providing your name, job title, organisation and email address.

The results of a meta-analysis conducted by researchers at the University of Essex show that a ‘dose’ of nature is good for your health and well-being. Professor Jules Pretty and Dr Jo Barton analysed ten studies conducted by the university over the past six years, involving over 1200 participants. They found that ‘green exercise’ improved self-esteem and mood irrespective of duration, intensity, location, gender, age and health status. The researchers therefore conclude that the environment provides an important, and often overlooked health service.

Physical inactivity results in roughly one in 25 deaths worldwide, linked as it is to obesity and as a risk factor in many chronic diseases. More than half of the world’s population now lives in urban settlements; contact with the environment is becoming rarer. The resuls outlined by the University of Essex suggest that access to local greenspace should be prioritised in the design of sustainable towns and cities, leading to both conservation and health benefits – and therefore benefits for the economy and society.

The researchers’ analysis showed that mood improvements were greatest in participants undertaking light and vigourous activity, suggesting that there is a health benefit from any short engagement in green space. The presence of water generated greater improvements in mood and self-esteem for all participants. The greatest change for self-esteem as a result of exposure to green exercise was in younger participants, with diminishing effects with age. The mentally ill showed one of the greatest improvements in self-esteem, suggesting significant value in encouraging this group to undertake green exercise.

The researchers acknowledge that more needs to be done to disentangle the relative contribution of exercise per se and green environments to the mood and self-esteem alterations demonstrated. Research is also necessary to assess the benefits of undertaking green exercise with other people (social capital) and the benefits of connections with animals. However they conclude that attention should be given to the use of green exercise as a therapeutic intervention on the basis of the evidence presented; that planners and architects should improve access to green space and that children should be given the opportunity to learn in outdoor settings. Shifts in urban design, transport policy, support for social care and parenting can help to embed physical activity as a necessary part of life, and ensure that the public are able to take advantage of the full suite of benefits provided by green space.

Pretty, J., Barton, J. What is the Best Dose of Nature and Green Exercise for Improving Mental Health? A Multi-Study Analysis. Environmental Science and Technology (March 2010).

The Natural Capital Initiative will be organising an event later this year focused on ‘ecosystem services and health’. Further details will be available on the NCI website in due course. To register your interest contact Policy@BritishEcologicalSociety.org.

According to the European Environment Agency, nearly 3,000 Londoners die every year from inhaling particulates, airborne particles emitted mostly by car exhausts. Six months ago, the European Commission gave formal notice that it was prosecuting Britain for failing to meet a limit for particulates that the Government agreed 10 years ago, and which came into force in 2005. Levels of particulates were meant to be decreasing, but have instead gone up.

The Government has responded by asking for a grace period to get levels down in the most polluted bits of the country – identifying parts of Glasgow, Swansea, the West Midlands, West Yorkshire, Yorkshire and Humberside, Eastern England and Brighton, as well as London.

The Commission will decide by February whether it will grant such an extension. The EC sets three criteria for leniency, and whilst most of these areas will probably qualify, it seems unlikely that London will meet the criteria. And even if London does get an extension, it will run out in 2011. On present trends, the capital is still unlikely to have cleaned itself up by then, and the Telegraph has suggested this could set up a huge potential embarrassment at the Olympic Games, with athletes complaining of the conditions and the media harking back to the days of the pea-soupers.

Moreover, by 2012 the country is also likely to be facing prosecution for a second pollutant, nitrogen dioxide. More than 100 towns and cities across the UK exceed the legal limit due to come into force next year, while average levels of the gas at roadsides in inner London are double it, giving London the honour of being the most polluted capital city in Europe.

If the Government is successfully prosecuted over either pollutant, let alone both, the country will face an unlimited lump-sum penalty, plus daily fines while it remains in breach of the limits. These fines, combined with the pressure of hosting a ‘green’ Games, may finally galvanise action.

For further details, please see The Telegraph.

A new report suggests that more needs to be done to adapt systems models to adequately reflect the dangers posed to human health by climate change.

Most research on the impacts of climate change has focused on the environmental consequences, rather than the health impacts. The Intergovernmental Panel on Climate Change (IPCC) predict that it is very likely that climate change will increase threats to human health. Direct impacts are posed by an increase in the incidence of extreme temperature and weather events, whilst indirect effects could be the increase in infectious disease, for example malaria, caused by warmer temperatures and changes in the hydrologic cycle.

Modelling the health impacts of, for example, malaria, and how this may change under climate change scenarios, is complex, due to the range of factors which can affect the geographic range of the vector, such as drug resistance and economic development. The report suggests that new models should better account for these drivers and develop country-specific projections of risk.

The priorities of healthcare funders are identified as one of the key factors limiting development of these models. To date, healthcare funders have had little interest in developing interdisciplinary models – for example modelling the interaction between land-use and climate change on human health.