I don't know about Fire or Ice, but a nice global killer asteroid would do the trick. Then the planet could reset, reboot, shift paradigms, or whatever term is part of your vernacular. It happened 66 million years ago and everything was going just fine up until about 4 million years ago. Some little hominid comes along and and decides to hang out in Oldavai Gorge, use tools, create religion, establish an economy, and now everything's a mess. Maybe Earth 3.0 will be a better version.