As to background, I am a biologist and environmental scientist by training, an economist by exposure, and a policy analyst by vocation: I've spent the last 15 years analyzing environmental policy in think tanks in the U.S. and Canada.
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Finally, my beliefs are based on reading the scientific literature as well as the IPCC climate science reports, and I believe that while greenhouse gases do retain heat in the atmosphere (making Earth habitable), the heat-retention capability of additional anthropogenic greenhouse gases is modest. I do not believe in predictive climate models, or most other forms of forecasting other than simple extrapolation for very modest periods of time.