In short, we aren’t on track to an apocalyptic extinction, and the new head is concerned that rhetoric that we are is making people apathetic and paralyzes them from making beneficial actions.
He makes it clear too that this doesn’t mean things are perfectly fine. The world is becoming and will be more dangerous with respect to climate. We’re going to still have serious problems to deal with. The problems just aren’t insurmountable and extinction level.
It’s terrifying.
We won’t get to 2100 before things really get awful either. We’ll get to 2035-2050 and then things like cascading crop failure will happen, causing a global collapse in the food supply.
If we reach that event occurring it will functionally prevent governments from cooperating to reduce carbon emissions. They will all be focused internally on turmoil and massive unrest generated by mass famine. Many will turn up the carbon dial in order to try and address this. Others will simply have revolutions that take considerable time afterwards to stabilise making organised effort unviable.