Re: Species impact
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I don't know the answers, but tolbiny's rat answer is likely a good candidate for #2 as is yours regarding the mosquito
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I think the word species here is what makes it so difficult to answer for a non specialist (ie me). I think Borodog is on the right track by looking at atmosphereic changes as they can effect the entire world more easily than other changes, but i think hes got it backwards. I would look at carbon fixing organisms first, things like coccolithophores which are responsible for the White Cliffs of Dover and other enourmous deposits of calcium carbonate. I also think that they effect the pH levels of the ocean (trying to remember 10th grade biology here), which would be an enourmous impact. Problem is there could be thousands (or more) different species contributing to this process, how to estimate the impact of one?
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