Curbing climate change is arguably the most important non-financial topic your firm should be reporting efforts on; read here why (January 2018 post) and how (February 2018 post).
To push yourself to become familiar with the numbers for climate change, internalize the range where the world enters a zone of uncertainty, see the table below by the Stockholm Resilience Center (excerpt from a list with all their planetary boundaries):
Then see for yourself that we already crossed this boundary on the excellent CO2.earth website:
Do as I do, and bookmark their daily CO2 count in your web browser and follow CO2-count on a regular basis to internalize the parts-per-million concept of CO2 (on May 14 on 412 ‘parts per million parts in total in the atmosphere’. Here is a link to their daily count: https://www.co2.earth/daily-co2.