It's been a British military base for hundreds of years now with a regular scientific presence on the island. There are no humans indigenous to the island, and looking it up now only a few species of fern are the indigenous vegetation
Humanity has been a devastating cancer upon the earth so far. North America had 97% of old growth forest chopped down before 1900
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There used to be 70 million buffalo on this continent too, ranging across the infinite prairie. Now only a few thousand remain in small fenced in preserves. The amount of damage is mind-boggling and this is nowhere even near the tip of the iceberg
In regards to the invasive discussion, a lot of plants are classified as invasive not for ecological reasons but for economic ones. Because they interfere with the human industry of destroying the biosphere