Yes, we can. If you look at the Kardashev scale, it is possible that the world is dependent on renewable energy sources. On that scale, our world will be able to depend on renewable energy sources on a scale of 1 and now we are on a scale of 0.7, meaning we are approaching civilization where we can utilize all renewable resources on the earth and the sun. Maybe we will not be able to completely get rid of fossil energy because it is also needed to make our world warmer, but perhaps the amount will be drastically reduced and its use will be more restricted.