In both senses, of course.
This is my favorite chart (originally referenced here). While the data of the chart is income distribution, the upward curve could be... An engine overheating, a nuclear power plant melting down, or ... global warming, for example.
Readers, do you have favorite charts with curves that look like this?
Mix 'em, match em, share 'em with your friends!
Post as IMGs in comments (ask someone, if you don't know how), or link. Let's go critical!