Well lets see.
Asteroids?, well they do keep a look out for them near earth objects given time fly a spacecraft to said asteriod and DEFLECT it a bit so it misses earth. Or wallop it with a 100 Megaton bomb which may break it up and or deflect it unless its a Very big asteroiud and by big much bigger then the one that did for the dinosaurs!.
Pandemics?, well the black death and the plauge of Justinian did for a lot of peeps but they din;t knew re Bascteria and have antibotices in those days The Great 1918 Flu very bad they didnt knwo whart Virsus were back then the Corna Virus yes a bloody nusiance but a lesser event to the world then the other incidents in the past!
Starlink?, Elon Musks attempt to bring low cost high speed to the whole world but he's pissing Asteromers off big time as his sats are so brfght he's tried to dim one of them dowm a but there ought ot be a sort of UN for space and who does what there.
Global warming; I don't belive all that I read on that. Neither do a lot of other academics either yes may well help a bit less CO2 . Like electic cars the power comes of the still mainly fossil fuel powered grids more small scale Nukes are needed!
And yes Nuclear war; that will be the big baad one but thus far ?. We still don't know all about of what anti missile missle and anti missile system are around to protect us!.
Goverment incompetence: There all the bloody same all of them!
and Aliens! never met one yet if the do exist i'd liek to see them rocking up to Watford high street but they never do, do they now Dorking, Huddersfild,Gravesend, Bolton or Wigan either. And where would they come from someones discovered an Earth sized planet 300 light years away!
Thats some 175,970,880,000,000 Miles!!! If anyone wants to check that please do!
I'd hug your nippers and stop worrying and sleep soundly:)