Explain why it is difficult to attach a value to the aesthetic qualities of biodiversity

Because aesthetics is subjective.  Everybody thinks beuty is worth a different amount of money.  Also, the beauty of nature has an unmeasurable effect on the human brain.  We need it to be healthy and relaxed and unstressed, but everyone's brain reacts differently.

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.