Rising geopolitical tensions and high oil prices are continuing to help renewable energy find favour amongst investors and politicians. Yet how much faith should we place in renewables to make up the shortfall in fossil fuels? Can science really solve our energy problems, and which sectors offers the best hope for our energy future? To help us get to the bottom of this we spoke with energy specialist Dr. Tom Murphy, an associate professor of physics at the University of California. Tom runs the popular energy blog Do the Math which takes an astrophysicist’s-eye view of societal issues relating to energy production, climate change, and economic growth.