For those who are politically active and take part in public demonstrations- especially environmentalists, a great way to post public messages in demonstrations is to stop using placards which take up paper resources. Typical usage of placards for public demonstrations pictured below:
Using a placard only allows a message to be written once. But by using a magiboard or blackboard to display a message, you can erase it and use it again and again. This will also reduce paper resource consumption as well as costs.
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