Climate Change Emergent Tech Doc (What Has Carbon Capture Done For Us?)

I'm looking for a Second interviewee well versed in climate science, physics and chemistry to go on camera and describe the basic process of solar radiation hitting trace gas emissions and generating energy that is ultimately trapped as infrared radiation. It will form a small segment in a self funded documentary looking at emergent technology and other solutions being deployed to counteract man made emissions. The Location of the interview is London, it's a fixed fee for One Hour.