Questions to Raymond Bradely

If i were to ask him two questions they would go as the following:
1. With how much confidence can you tell me that ice cores and other artifacts can be used to accurately measure climate change?
         - I would want to know this, simply because everyone says they can predict the past using ice cores and other cores, but how can anyone be sure if they were never actually there.
and 2. In your personal opinion are human factors truly harming the environment and how much do they deviate from norms?
         - This is important to me, because if he cannot answer the above question then this would at least give me and understanding that they have some facts to say so. Without facts most scientists would not give an opinion or even speak on an issue.