The landmark Paris Agreement adopted in December 2015 has sent a historical signal: over 190 countries in the world have recognized the need for urgent climate action. If we are to keep the global temperature rise under 15 degrees C, the transition to a 100% renewable global energy system, which is already underway in many communities, cities and countries, should be dramatically accelerated. As costs of solar, wind energy and battery storage keep falling, and emerging markets lead in investments in renewables is no longer a long-term vision, but a tangible reality. The challenge is reaching a maximum synergy between various renewable energy resources and technologies across different regions of the world.