The Great Global Warming Debate: Part 2
Earth's climate has changed naturally over millions of years. Could the current cycle of warming simply be part of this natural cycle? Earth Science - Human Impacts - Learning Points. The Medieval Warm Period occurred 1000 years ago. Climate proxies are used to estimate historical temperatures. The hockey stick graph shows a temperature rise across the 20th century. Graphs show that the last half of the 20th century is the warmest it's been for the past 1000 years. A Twig Context Film. Reinforce and extend the learning required by the curriculum. Twig’s context films show abstract concepts in action in the real world.
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