Global warming remains a controversial issue: for some (including the current US administration) it's still a theory rather than a fact. Gore acknowledges that, but then (turning more political towards the end of his speech) he quotes Churchill: "The time for procrastination and delays and excuses is over, we are into a period of consequences - think Katrina - and we must act now". He adds: "We have no more than 10 years within which we can make a difference; otherwise it's too late. It's a question of political will, but in a democracy political will is a renewable resource, and we need to renew it".