Renewable Energy-- Science contribution

How much science is contributing towards research on  renewable energy resources , how much a common man care and know about the  renewable energy resources we have , how long will the conventional energy resources last and what all are the future resources for catering energy, some of the resource we know are Solar energy, but can this resource be in a reach of common man can he afford it , How much is the world spending in Dicovering new horizons for renewable Energy resources , what are the alternate biofuels in News which are potential source of power in future ..........Share your opinions and views about

Green energy Science ,  how can we contribute towards it and what are the latest discoveries in this Field  as  we know our future depends on Energy