If anyone tells you that we must move toward renewable energy, don't believe them. If they tell you that we are soon going to run out of carbon fuels, likewise, don't believe them. Most of those who are pushing for us to switch to renewable energies have ulterior motives and other agendas, like making lots of money, bringing down the economy of developed countries, or being politically popular.
If you are at all interested in the future of energy, you need to read this great article by Matt Ridley. Gas is the future. Now we just need to see how long it takes for the politicians and greenies to accept that fact (if they ever will).