Martin Parry, Jean Palutikof, Clair Hanson and Jason Lowe, all four respected and known scientists from the IPCC, have written on The Nature about the dangers of false optimism regarding climate change. They warn that the "damages will be large" if we continue to believe that we have climate change under control.
They also warn that a 50% reduction of global emissions below 1990 levels (note that a 50% reduction is often referred to as "stringent" in the political world), that the G8, EU and the UN climate change conference in Bali last December has urged for, "will not avoid major global impacts."
According to them even at an 80% reduction of global greenhouse gas emissions "damages will be large" and "likely to be unavoidable."
Martin Parry, Jean Palutikof, Clair Hanson and Jason Lowe are just a few of all the other scientists that recently have spoken out about the dangers of playing down the effects and risks from climate change.
Their message is clear.
We need strong actions today. Tomorrow will be too late.