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Attack of the alien invaders


Attack of the alien invaders
Pest plants and animals leave a frightening $1.7 trillion bill.
Credit: Jason Jones Travel Photography / Getty Images
They’re one of the most damaging environmental forces on Earth. They’ve colonised pretty much every place humans have set foot on the planet. Yet you might not even know they exist.
We’re talking about alien species. Not little green extraterrestrials, but invasive plants and animals not native to an ecosystem and which become pests. They might be plants from South America, starfish from Africa, insects from Europe or birds from Asia.
Yellow crazy ants, such as these attacking a gecko, are among thousands of invasive species causing ecological and economic havoc. Credit: Dinakarr, CC0, Wikimedia Commons ....

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El daño que causan las especies invasoras: 27.000 millones de dólares

El daño que causan las especies invasoras: 27.000 millones de dólares
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Pests wreak economic carnage of US$1.28 trillion


Stock image: Rosielen Raymon Photography
New analysis has revealed the stark US$1.28 trillion economic damage caused by the world’s invasive species over the past half century, with a group of global experts warning damage and management costs will soar unless biodiversity agencies can improve prevention and control of biological invasions.
The research, published in leading global scientific journal Nature, shows invasive species have damaged crop yields, critical national infrastructure, human health and diverted billions in taxpayer dollars annually, but too little is being done because the impact isn’t well-recognised by decision-makers and the public.
Biological invasions take place when species of animals, plants and pathogens are deliberately or accidentally introduced in regions not previously occupied by these species. ....

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