International Herald Tribune: There is such a buzz around renewable energy that you might think these technologies are developing fast enough to meet the majority of our power needs in coming decades. Think again. The use of wind, solar and geothermal energy is growing rapidly, but from very low levels in many of the most energy-hungry nations. Fossil fuels make up two-thirds of the global energy mix and would still make up almost half by midcentury – even under scenarios where annual emissions are kept at the …