Matching Pairs Citizens, save the world!Online version Citizens, save the world! by Karen Sillig 1 The planet has witnessed several periods of mass extinction and has endured. 2 Deforestation is responsible for over 20% of the greenhouse effect gases that cause climate change. 3 More than 100 species go extinct everyday. 4 Climate change is normal. The planet's been through ice ages and periods of higher temperature. Humans have a great impact on the planet. Let's stop deforestation! The planet is fine. Extinction is a natural process. The planet is fine. Climate change is a natural process. Humans have a great impact on the planet and extinction of species is one of them.
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