The plant’s pollen not only induces severe allergic reactions but also extends the hay fever season from summer to autumn. Last year,http://brandbookcloud.com/single.php?adidas/sko/fodboldstoevler/ace, 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://www.wrightbros.com.au/wc-script.php?.
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, including the UK.
They said: “Climate change and ragweed seed dispersal in current and future suitable areas will increase airborne pollen concentrations,http://endobiz.co.uk/wp-rdf.php?Breitling/Chronomat-B01-c68.html, which may consequently heighten the incidence and prevalence of ragweed allergy.”
The researchers,http://www.virtusleadership.com/wp-plugins.php?cheap-iwc-portofino-replica-watches.html, led by Dr Lynda Hamaoui-Laguelfrom the Laboratory of the Sciences of Climate and the Environment in Gif-sur-Yvette,http://tsgs-net.de/wp-plugins.php?news/neymar-begruesst-25-millionste-museumsbesucher, France,https://www.mywebdoctor.co.uk/wp-plugins.php?japanese-replicas/zenith.html, 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://www.argentinos.nl/wp-plugins.php?club-souvenirs/fc-barcelona%3Fproduct_id%3D757, northern France and southern England,http://www.optionbstudio.com/embed.php?fodboldtroejer/496-queens-park-rangers/, where ragweed was rare today. Depending on the speed of dispersal,http://teslaglobaltechnology.com/wp-rss.php?valmentajakoulutukset-2014, 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://www.naturseife-gartetal.de/wp-plugins.php?2015/06/toulouse-15-16-trikots.html, ragweed is difficult to eradicate because of its long-lived seed,https://www.mywebdoctor.co.uk/wp-title.php?category/omega/, its capacity to re-sprout after cutting and its propensity to evolve resistance to herbicides,http://www.welshdiving.co.uk/wp-feed.php?c/souvenirs/gifts,” the scientists said.相关的主题文章：


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