A Royal Dutch Shell Plc executive mapped out an efficiency-driven world’s road to a net-zero emissions future on Oct. 2 at Rice University.

Achieving the goals of the 2015 Paris Agreement on climate change won’t be easy, either from technological or political perspectives, Wim Thomas, Shell’s chief energy adviser and head of the company’s energy analysis practice, said during a presentation at the Baker Institute for Public Policy.

However, Shell’s Sky Scenario is both doable and affordable, he said. Following the plan modeled by Shell’s team, the world could achieve the Paris Agreement goal of an average global temperature of less than 2 degrees Centigrade above pre-industrial levels.