Theory:

Slogans are catchy phrases or verses that are arranged in a specific way to attract the audience and make them remember our product/idea/business, whichever is being promoted. A perfect slogan should be able to express a complex idea in simple terms but should be interesting and unforgettable at the same time. Rhyme, satire, irony are some of the devices used to make slogans unique.
slogan.jpg
An example of a slogan.
  
Slogans on saving trees:
 
1.
Save more trees to Save Nature
Kids will thank you in the Future!
 
2.
Nature gives us trees,
Tree gives us breeze,
Breeze gives us ease,
Lets save them please!
 
3.
Save at least one tree,
Get a healthy life for free!