Faced with a new catastrophe such as devastating climate change could we become mass killers again?
Could we become? If you mean to imply that we're NOT mass killers
right now, than you're
willfully ignorant about the situation on this planet.

I was almost certain you would reference how your pet Hell is engulfing us all the time, and how happy you are that Hell is growing right here on earth. But of course. Having been in Hell, probably takes away a little of your ability to express yourself.
