Our average CO2e emissions per employee have been shrinking since 2012, when we first began measuring the carbon footprint of our operations. In 2019, they reached a new low of 2.8 metric tons (with offsets), a 10 percent reduction from 2018. Also in 2019, we purchased renewable energy certificates (RECs) to reduce our CO2e emissions from electricity consumption in our U.S. offices by 25 percent. This was the largest driver of our reduction from last year. These statements, however, must be understood in the following context: We conduct a full analysis of our carbon footprint once every two years. For 2019, our analysis was partial, including updated data for electricity and business travel but incorporating data from the 2018 full analysis for other emissions areas.
Every year since 2014, we have offset all carbon emissions from our necessary air travel by donating 10 dollars per metric ton to Carbonfund.org to support energy-efficiency and renewable-energy projects. This year, we offset our emissions from train travel as well. Before offsets, we reduced CO2e per employee to 4.2 metric tons of CO2e – a 26 percent reduction, compared to the 2012 baseline.