It's happening and I don't doubt our greenhouse gas production is accelerating it, but even if we cut our emissions to nothing, the world would still warm slowly. We are still exiting an ice age, there will come a time where no ice on the poles in summer is normal (though naturally not for a very long time), we cannot easily fight that, and trying to might be damaging in other ways. We need to adapt.
Fossil fuels wise we need to move away from them, and of course we will have to, because within a few centuries they really will start to run out.