@Fyrius I was going to make the comment about anthropomorphizing inanimate things, but I read through to see if anyone had already made it, and you had! Good job!
So what does that leave me? Do I want to take an opposite point of view just for fun?
Well, I think that there is a way of looking at questions like this as not really being what they look like they are about. I think we frame questions like this as a way of creating meaning or purpose for ourselves. @zookeeny might be looking for some confirmation of his or her own view of meaning.
Most of us know that meaning is what we personally want it to be. We say that by insisting that the earth is inanimate and there is no why for its or our existence. It happens, but it doesn’t mean anything in a larger sense. It’s not like the universe has a plan. We just are.
Even so, the question also poses another underlying theme: how should we treat the earth. Depending on how we see it, we may take different courses of action. This is quite relevant to the global warming debate.
Some people argue that the Earth is a garden that succors humanity, and, as such, we need to be good stewards in order to protect our descendants and our species. Obviously, then, the Earth is here for us, and is ours to do what we will with.
Other people argue that it doesn’t matter what humans do. We can’t control the Earth on a global scale, and we are merely a part of an eons-long pattern where Earth grows hotter and colder as various factors affect it. This, I suppose, is the awkwardly conceived “we are here for the Earth” meme.
Both phrases bring in the idea of service—with the question being who serves whom. This idea of service as a particularly human idea, because it is what works in a social context. It is a survival strategy. It is about cooperation.
In response, people suggest the question—“is cooperation possible with an inanimate object?” I don’t know. Is it?
The Earth’s “behavior” is an incredibly complicated, interlocking, interdependent system. It seems to me that humans are displaying a lot of hubris in believing they can understand enough about the atmosphere to be able to intervene in it’s behavior. For God’s sake, weather reports aren’t accurate more than five or ten days out, and we are trying to predict and affect an outcome centuries away????
While the effort is laudable, I think it is also laughable. I think it would be far better to spend our money trying to prepare for the consequences of rising sea levels, and increased warmth in the middle latitudes. There will be huge migrations of people, although they will take place over a long period of time. We need a better way to manage migration—which is already a big problem.
Moving to wind and solar power makes sense, because it is a more efficient way of generating power – over the long run. Building buildings so they use less energy also is more efficient, saving money to pay for health care (you didn’t think it was going to go for fun things, did you???) I really don’t think we need to worry about the carbon footprint of industry. Competition is going to take care of that for us. The energy profligate industries just won’t be able to compete.
End of political statement, and back to philosophy.
What is the mean of human presence on earth? People often mistake this question as seeking a larger, global or universal meaning. However, all meaning making is relevant only to humans, and there is no evidence that there is any other conscious entity out there to care. The universe, as far as we can tell, is both a clock and a chaotic system (anyone have a good metaphor for that idea?), and it may only exist, as @Harp reminds us, because we are here to perceive it.
So what is the meaning of this planet (our planet?) to humanity? Well, that’s for every individual to decide for themselves. What one person believes is what they believe. It’s not right nor wrong. They might want to try to impose their beliefs on someone else, but that’s just plain rude!
Still, beliefs matter in a social context. We can organize groups to enact one set of actions or another. That’s called politics. We take actions based on our beliefs, as if our beliefs have a high correlation with what we think of as the real world. But beliefs are not highly correlated with the behavior of the real world. So that makes them into something like the dogma of a religion. It becomes a matter of faith.
Which brings us back to the question. Is the earth is here for us or we are here for the earth? This is a question about faith, and it is phrased in the language of faith. For those without faith, it is a meaningless question. All one can do is be agnostic.
Unfortunately, many people feel extreme discomfort with agnosticism, because it provides no guidance for action. Most people would rather take action—any action—rather than remain agnostic. Agnosticism is a socially untenable position, because everyone else wants you to identify yourself. Well—I’m not going to. The simple truth is that I don’t know whether the earth is here for us or we are here for the earth.