<p>Coal, oil and gas provide four-fifths of the energy that powers our modern world. But continuing to burn them will mean wrecking the only planet we have. Is there a way out?<br><br>In The Future of Energy, journalist and analyst Richard Black argues that there is, and that the transition to a clean energy world is already underway. He shows that with just five key technologies we can replace the burning of fossil fuels almost entirely, as quic...