Asian hornets, American crayfish, ragweed, Japanese knotweed, squirrels and raccoons make up the proliferation of invaders boosted by globalisation and climate change ravaging crops and forests, spreading disease and threatening the quality of life on Earth
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00:00 A disaster in slow motion. Around the world, invasive species are having an economic impact
00:07 of more than 390 million euros per year. That's the conclusion of a UN study carried out over
00:15 four years across the globe. From plants to mammals, marine animals and insects, these
00:22 alien species are creating environmental chaos. Chief among the causes are climate change
00:27 and human activity. The introduction by anglers of minnows to this mountain lake in France
00:32 is a typical example.
00:40 The consequences are also deadly at times. It's thought the recent wildfires in Hawaii
01:05 that killed hundreds in devastated wide areas were accelerated by imported dry grass that
01:10 had been planted to feed livestock.
01:13 (electronic music)