The last time there was a major push for renewable energy alternatives to polluting fossil fuels was in the aftermath of 1970s oil shock. And then, everyone conveniently relegated the issue to the back burner. With oil prices spiralling through the roof in September, the prospect of clean energy technologies have brightened again, raising hopes of a concerted effort against climate change. Is there an end to the world's dependence on oil? Or will Europe buckle under the pressure of transport strikes, backtracking on policy to tax fossil fuels? Will the Indian government keep playing to the gallery? Some questions and their answers