I believe that self interest will rule the future. To use this force of humanity to solve the greenhouse effect seems natural.
Solar energy is the only available energy source large enough to displace coal.
I am hopeful that the Internet can supply solar alternatives to a very bleak future. Solar concentrators have low material intensity compared to other solar collector types and can be produced below the consumer cost for burning coal in diverse economies. But, this is tough. In Beijing they burn little coal briquettes in stoves for heat. Outside it is usually cold, sunny, and windy.