Ecological tipping points related to the earth's major natural systems are also called

Ecological tipping points are the points where environmental problems reach threshold level causing irreversible shifts in the behavior of natural systems. These are also called thresholds where the biodiversity changes.

Aregion is an area of land that has common features. these features can be natural, such as climate or landscape. they can also be artificial, such as language or religion. the xinjiang uyghur autonomous region, above, is an area of china inhabited by uyghurs, a muslim group with ethnic ties to turkish people.

Ibelieve it is the 2nd answer, create gardens on all rooftops. let me know if this .