If there are 2500+ scientists working in this area they must be of very low expertise level, since they still cannot prove that humanity is responsible for the climate change but can only enthusiasically say that there is 90% probability for this. It seems that the 2500+ are beginning statisticians who have "found" a correlation between temperature & sea level rise and population increase, both of which are well documented since the 1600's. The trouble with beginning statisticians is that when they find such a correlation they really believe there is a cause and effect relation.
For me, unless a statement is proven it is only a hypothesis. And don't come to me with proof derived from any computer model, because they are NEVER a substitute for reality.
Unfortunately this climate change - which has been happening for hundreds of years - has been taken up by politicians and other bodies as an effective scare story to build themselves up in public opinion and to subsequently coerce a lot of money from people's wallets. Talking climate change is a lot more effective than preaching traditional religion, nowadays. And for some reason people are lulled by curious actions like those coming from the Kyoto protocols. It is very strange that nobody from those 2500+ "scientists" is able to show exaclty what the effect is from the proposed actions, in lower temperatures and sea levels. People are happy as long as "something is being done". Unfortunately, the only thing that is really being done is that the public's tax money is being squandered for no clear effect.