By Julian Siddle
媒体英语会带大家一起学习BBC撰稿人在报道世界大事时常用到的单词和短语。
背景：波罗的海正面临5年来最大的海藻疯长问题。海藻的泛滥不仅对海洋生物的生长造成影响，同时也给对环境变化亮起了一个指示灯。
Media EnglishSatellite images show the green algae spreading across the Baltic from the coast of Sweden eastwards towards Lithuania and Latvia.
The growth of this algae is a natural event which occurs every summer as temperatures rise.
But it's not just the heat causing a record increase. This has been partlyfuelled by agriculturalfertilisers, applied on land, which find their way into water systems.
Researchers from the Department of Botany at Sweden's Stockholm University have raised concerns over potentially dangerous chemicals present in the algae, which they say are linked to degenerative brain diseases. They warn against swimming in any areas covered in algae.
Algae is a fairly fragile plant, and although the current bloom in the Baltic Sea covers over 350 thousand square kilometres, it is likely to be broken up by waves and summer storms.
For human health the high summer temperatures being experienced across northern Europe are more of a concern. A heatwave in 2003 killed more than 40 thousand people in the region and this year record temperatures have been reached in many places around the world.
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