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Originally Posted by natterjack
I assume that the point of this is: "Changes happen on other planets where we clearly have had no impact, hence any changes that happen on Earth are not due to our actions..."
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Not quite, but perhaps something like this: Changes happen on other planets without us, thus it is possible for changes to happen on earth without us too."
I doubt Environmentalists would even agree to that. It seems to me that their thinking is that all change is due to us, and without us there would and could be no change.
Certainly the fact that we exist changes the dynamics, even the dynamics of the entire universe, however infinitismally small that change may or may not be.
But to show our influence upon a system and then conclude that we are the only and supreme influencing factor is going a bit too far.
Ice caps on Mars are melting too, but we are clearly not influencing this to any reasonable degree. Hence their exists the possibility that if we were'nt here, our ice caps might also still be melting nevertheless - even without our influence.
So my question becomes: Is it possible for a planet's ice-caps (including that of the earth) to melt without our influence?
If the answer is no, then it follows that we must be the direct cause of Mars' ice-caps melting too. Not so?
