"natural balance" aka a bunch of rocks
We would harm our own future geologic/historic/archeological (or whatever the term for this is that doesn't mean specifically humans) missions by potential contamination but in terms of "destroying" the ecosystem of the planet, it is hard to imagine them getting much worse in any way
THIS IS WHAT I HATE A BOUT EVREY WEBSITE!! THERES SO MUCH PEOPLE READING AND POSTING STUIPED STUFF