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Human ancestors have been using stone and other tools since long before the emergence of Homo sapiens approximately 200,000 years ago.[20] The earliest methods of stone tool making, known as the Oldowan "industry", date back to at least 2.3 million years ago,[21] with the earliest direct evidence of tool usage found in Ethiopia within the Great Rift Valley, dating back to 2.5 million years ago.[22] This era of stone tool use is called the Paleolithic, or "Old stone age", and spans all of human history up to the development of agriculture approximately 12,000 years ago | ENERGY 2 TECHNOLOGY 2 PERSPECTIVES 6 In support of the G8 Plan of Action OECD 1 z Warning X Please note that this PDF is subject to specific restrictions that limit its use and distribution. The terms and conditions are available online at WWW. iea.org vv bookshop pricing.html Scenarios Strategies to 2050 r Ỉ A 4 Sách có ball quyên INTERNATIONAL ENERGY AGENCY ENERGY 2 TECHNOLOGY J2 PERSPECTIVES In support of the G8 Plan of Action Scenarios Strategies to 2050 Sách có ban .
