3.1. Current and Future Impacts

The What We Know booklet provides a brief overview of the impacts of climate change on natural and human systems. Read pages 8-12 of the document (not the pdf page numbers).

Watch the video: "What are the Potential Impacts of Climate Change?" (http://greenninja.org/cliamte-change-qa/what-are-the-potential-impacts-of-climate-change/) to answer these questions:

a. Earth has been warmer in the past. Why is current climate change of great concern?

b. Referring to graphs discussed from about 3:35-4:50 in the video, explain how changes in the mean temperature affect temperature extremes? Record your response to this question in the Lesson 3 Response Form.

c. What do the bar graphs discussed from ~5:00-5:49 show about how ratios of record high to record low temperatures have changed over time?