How do you interpret the importance of biodiversity?

I interpret it as integrity. Here is an example: you can find a man who is a carpenter and he can build you a church steeple at a fraction of the cost you might have to pay if you hired it out to be built by a contractor. If he is clever, he will also be able to find a team of men to help him put it into place properly when it is finished and ready to raise up where it belongs. Caring for our planet is the same. Groups of people are discovering they can do equally as much on their own to impact our planet in a positive way than massive appeals to millions of strangers to impact in a dubious way which might take years. A single windmill is a fascinating thing to me. Wind power. The blades just turn and turn... but you have to build them far enough away from people so they don't have to hear (and sometimes don't have to see) them. The other thing which always made sense to me is tidal power - you know, the tremendous force of the tides moving first one way and then another, over and over again. If that is not a dependable source of power I do not know what would qualify. These are my thoughts in response to your question...

Without at least a certain amount of bio-diversity, life would get pretty boring. Also, the more species there are, the greater the likelihood of finding "natural" remedies for a variety of ailments. The "Earth's integrity" might be, in some sense, necessary for human well-being. But if we want to preserve bio-diversity, then highlighting its benefits for human survival is probably essential.