Weirdly birdsong kinda helps. This or brown noise/ocean sounds are also not bad.
There are blue light machines intended to mimic a summer sky but maybe you could get the same effect from a bright blue screen?
A hammock or a beanbag can also provide a calming even pressure. I haven’t tried a weighted blanket but might if there’s a cheap one.
I completely get the climate change anxiety too.
We’re now kinda in the find out stage of fucking around, and the first climate refugees are starting to arrive in Australia. Plus I do not handle heat well at the best of times