Xinhua: New technologies are the only way to tackle climate change, a special adviser to the U.N. Secretary-General said here Saturday. "Rapid economic growth and climate change mitigation cannot go together as long as we stick to current technologies," Jeffrey D. Sachs, director of the Earth Institute told delegates at the valedictory session of the Delhi Sustainable Development Summit. "But there are a host of technologies that are close (to breakthroughs), such as …