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Human kind has been inventing and creating survival tools dated as far back as the Paleolithic era nearly 2.6 million years ago. Earth has gone through several changes and our environment has been affected negatively. Mankind has increased life See MoreSolar Energy Human kind has been inventing and creating survival tools dated as far back as the Paleolithic era nearly 2.6 million years ago. Earth has gone through several changes and our environment has been affected negatively. Mankind has increased life