A poster that is able to successfully define the need of our mother earth and the measures to conserve the resources and protect the environment. 
Think about this and frame an idea to make such a poster.
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i've come online after many days.....
U need to specify the need to protect our environment in your poster.Using this u van make a poster .an example of a poster is attached below.
hope i helped u:)

plzzzzzzzzzzzzzzzz mark as best:) if helpful