Every northern summer Arctic Sea ice melts away and reforms for winter, but how much melts away seems to be increasing on average, at a rate that surprises climate scientists.
But there are some who see variation from year to year, and there is variation, in a rather unrealistic way. Here is a graph comparing how climate science denialists view arctic sea ice over time, compare to how "climate realists" (i.e., smart people who can read graphs and such) see it:
Go HERE to see the source and learn more about what is behind this graph.
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Naming Some Special Graphs
One kind of graph problem that's extremely widely used in computer science is called graph coloring. There's two versions of it, *vertex coloring*, and *face coloring*.
Let's talk a bit about graphs, being a tad more formal about them.