Former EPA chief Lisa Jackson, hired earlier this year to head up Apple's environmental efforts, told a sustainability conference that she plans to get Apple to use energy more efficiently and with cleaner power in the company's data centers and other buildings. According to GigaOm, Jackson said "Tim Cook didn't hire Lisa Jackson to be quiet and keep the status quo. We understand our responsibility and we do care." Jackson talked about the challenges of pushing and developing sustainability projects within Apple. One of them is the challenge of collecting solid data and being able to measure projects and their success rates. This includes Appleās method to calculate the energy use and carbon footprint of its operation