Is the personal work limited?

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Several days ago,I watched a TV program about the Enviroment and Wild animals. It shows black bears wake up ahead for hungry. The deep reason is that peolpe join in the team of plundering the pine nuts which are the main foods of black bears to store fat for dormancy. This news was greatly strike me. So I promise never eat pine nuts again. But some people say it is no useful do that. What do you think about this?