<span>It means think in terms of the health of the entire planet (globally) and act in accordance to that in your own backyard/town/area </span>
Those serbs were convicted of War crimes because they approve the policy of ethnic cleansing in the war.
Ethnic cleansing refer to the policy in which they massacre a specific ethnic groups in their society. This practice deemed as really inhumane so they had to be convicted because of that
A) An American railroad tycoon
Hope this helps!