Yes we are in a mass-extinction event, but no that is not because of climate change. Rather it is because we are destroying habitats left and right through deforestation, pollution, etc. Climate change is happening at such a slow glacial pace; I haven't seen any good data to suggest that the Climate is changing fast enough to produce harm.
Humans are undeniably accelerating climate change for the worse. Species are dying off left and right from it. Why is this controversial?