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canada
axel-heiberg island
1
climate-change
1
fresh-water ecosystems
1
geïntroduceerde soorten
1
introduced species
1
mars
1
north slope
1
oceanen
1
oceans
1
permafrost
1
schepen
1
ships
1
spitsbergen
1
springs
1
svalbard
1
transport over water
1
water ballasting
1
water transport
1
water treatment
1
waterballast
1
waterzuivering
1
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