The linked recordings of speeches contained in the article are from a recent conference of the American Academy for the Advancement of Science held in Vancouver, BC. Thus far I have listened only to James Hansen's 29 minute presentation which I found to be outstanding. It is a bit technical in places for ordinary people, but overall I think it provides a clear picture of the crisis that our ecosystem faces if we continue much longer with business as usual.
Dr. James Hansen, head of the NASA Goddard Institute for Space Studies, warns it isn't enough to reduce our emissions. We must actually take carbon dioxide back out of the air, to avoid entering a new and dangerous age of greenhouse living.