Reuters: G20 leaders must address bottlenecks in the global supply of rare earth elements or risk blockages in economic growth and the fight against climate change, industry groups from around the world said on Monday. “Without adequate supply to open access to such elements, global efforts to address climate change, promote innovation, and advance global growth will be significantly hindered,” the industry groups said in an open letter ahead of this week’s G20 summit in Seoul, South Korea. The letter…