Kaitiaki - What does it mean?

Kaitiaki 

We have been finding out and discussing about Kaitiaki. What does it mean? 

First, we discussed how parents look after and care for their children and their whanau.  Parents  are the kaitiaki of the whanau. 
This helps us to understand what looking after  or to care means.

We worked out that a Kaitiaki is a person or group that cares and looks after;

trees (Nadia), family and kids (Shriya), earth (Sunia), nature (Kyan), air (Lovate), natural resources (Lani), the 4 sub-systems (Alex), planet (Edward) and cares for everything in the world (Nathan).


But... Why should we care?