Oh who cares about invasive species...we've water to trap.

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BBC News - Charles Darwin's ecological experiment on Ascension isle


Two hundred years ago, Ascension Island was a barren volcanic edifice. 
Today, its peaks are covered by lush tropical "cloud forest".

Terra forming is just that. We want to bring earth to other planets. When we go to mars we will need things, like water. The more species we can bring along the better. We sit on top of a large group of other life. We depend on them for survival and they depend on us. It makes sense that we would take them off planet with us.