It seems like there are a fair number of questions/answers involving math:
- How is NOx mg/km from diesel cars and trucks related to µg/m3 in the air?
- What are the carbon emissions from the manufacture of the hybrid components of a Prius?
- Is there any link between deforestation and paper use?
- and many, many more
Some things, like CO2 -> CO2 can be done with html:
CO<sub>2</sub>. But that's awkward. MathJax code for that is simply:
CO_2. It also allows fractions to be easily formatted.