The plant’s pollen not only induces severe allergic reactions but also extends the hay fever season from summer to autumn. Last year,http://www.argentinos.nl/wp-plugins.php?, researchers from the University of Leicester recorded airborne ragweed pollen levels in the East Midlands high enough to cause significant hay fever attacks.
The weed is a far more potent allergy trigger than grass and experts fear it could pose a serious public health problem if it becomes established,http://onestopkidspartyshop.com.au/fantversion.php?academy/directions/stevenson_tech.aspx.
Scientists writing in the Nature Climate Change journal found that predicted levels of global warming were likely to create conditions favourable to ragweed across large areas of northern Europe,http://www.buskerudbyggservice.no/tag.php?647-landslag-draktsett/680-russland, including the UK.
They said: “Climate change and ragweed seed dispersal in current and future suitable areas will increase airborne pollen concentrations,http://teiebat.no/mail.php?USA-2015-Hjemme-Fotballdrakt, which may consequently heighten the incidence and prevalence of ragweed allergy.”
The researchers,http://www.faz-transports.com/wp-title.php?73-as-roma, led by Dr Lynda Hamaoui-Laguelfrom the Laboratory of the Sciences of Climate and the Environment in Gif-sur-Yvette, France,http://www.faz-transports.com/wp-searches.php?chaussures/chaussures-de-football?dir=desc&order=news_from_date&p=21, ran computer simulations that forecast a fourfold increase in European ragweed pollen concentrations by 2050.
“Substantial increases” in pollen load were likely to occur in areas such as north-central Europe,http://ginasbloomingfantasies.com/sidebar.php?danmark/fc-vestsjaelland/, northern France and southern England,http://vaninyhandbag.com/wp-title.php?Enrique-on-paattanyt-lykata-FC-Barcelona, where ragweed was rare today. Depending on the speed of dispersal,http://www.rockpocketgames.com/wp-walker.php?chaussure-de-football-vortex-id_8319967.html, pollen levels in some locations could rise as much as 12 times.
The northern spread of ragweed was expected regardless of whether a high or moderate level of global warming occurred. “Once established,http://auramodels.co.uk/wp-atom.php?men-watches/luxury-watches.html, ragweed is difficult to eradicate because of its long-lived seed,http://www.umursiparis.com/wp-rdf.php?profiler/profil-lionel-messi/, its capacity to re-sprout after cutting and its propensity to evolve resistance to herbicides,http://www.sellitnewark.co.uk/wp-atom.php?Breitling/Super-Avenger-c73.html,” the scientists said.相关的主题文章：


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