The Paris Climate Agreement’s entry into force has clearly not yet spurred policymakers to charge toward the goal of limiting climate change to “well below 2°C” and targeting 1.5°C, warn Dr. Jan Rosenow and Stefan Scheuer. Energy efficiency remains the key to success. A new study by the Regulatory Assistance Project, Oeko-Institut, and Stefan Scheuer Consulting shows that energy efficiency is critical for achieving the carbon reduction goals set out in the Paris Agreement.