Lecture 15 Why study past climate?.

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Presentation transcript:

Lecture 15 Why study past climate?

Why bother studying ancient climate Why bother studying ancient climate? Who cares what happened a long time ago? 1. Past variability can show climatic extremes that have not been experienced during recorded history 2. In order to understand the effects of human activity on climate, we must establish what the planet, the atmosphere, and climate change was like before human perturbations 3. Constructing and interpreting long-term records of climate are the only means to determine how periodic climate change is (All in all, we are just a blip) 4. Past is prologue “The farther backward you can look, the farther forward you are likely to see.” - Winston Churchill

The Climate Puzzle Movie: 50 minutes An overview of Climate Proxy Data and Modeling Climate: Past, Present and Future Cretaceous Greenhouse Climate Ice Ages Climate Little Ice Ages Greenhouse Gases (CO2 and CH4)