The Class-M Carbon Counter

A planet is considered "Class M" if it can sustain human life¹. We live on a Class M planet. However, the conditions that make a planet conducive to life may change over time, so it is important to have instrumentation and gauges and stuff that will keep track of important variables.

It is estimated that when about one trillion tonnes of fossil carbon is released into the atmosphere by human activities, we will have reached a critical point, at which time we may have to leave the planet².

We're nearly half way there.

James Hrynyshyn at the blog Class: M has devised a sort of tricorder that keeps track of the carbon release count-down, and embedded it on the left sidebar of his blog. Go have a look.

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¹That is, of course, a reference to Star Trek and is not real.
²We won't, however, be able to.