any more details you have? Does it primarily follow a single person, or a group of people? How old are the main character(s)? Is it likely a short or long running series?
@FiXato a group of characters, a few groups actually. There is like a set of 2 kids and 2 adults traveling around, and like a weird other place like a school with lots of kids, i think they are telepathic to varying degrees.
I seem to remember something about scientists using nuclear weapons to fix climate change, but that caused the apocalypse
@j if It's a #NewZealand production, it might be worth having a look at this list of article titles on Wikipedia: https://en.wikipedia.org/wiki/Category:New_Zealand_children%27s_television_series
Have you tried doing an image search on keywords such as "new zealand kids show" or "2000s kid series" as well? Might make it easier to recognise things than from a description? Or, if you recognise one of the actors that way in another series, you could look at their filmography.
@FiXato i have been through aus and nz lists for many different years, i will try again but unfortunately i dont think they are complete. I would love it if someone had Australia tv guide data in a database
Consider this a friendly, local pub. Make yourself at home, bring your friends, have a good time! Meet new people, have a laugh, enjoy the ambience, and the Oxford commas.