It is a fragment because it doesn't make sense on its en. Its a subordinate clause.
Wet
pet
let
met
set
debt These are the words that i can think of.
Solidarity is a tool for reducing inequality and social injustice in the world. Solidarity leads to the sustainable development of peoples. For this reason, it is essential that it be used for the benefits it can offer to a particular cause. Solidarity can be cultivated through education, as children or adults.
