> Regarding the data, it's not very conclusive. Given the scale of time over which data has been collected, is it sufficient to create a reliable model and predict the future changes in climate?

I think this part of the debate hinges critically on whether or not you think that core samples can be used to project temperature samples. If so, the data available to the models is vast and conclusive. If you reject that, the amount of climate data we have covers only hundreds of years.