I heard one option for addressing climate change is a huge sun shade between us and the sun. I figure that sounds like something that could be tuned into a radio telescope array or something. Maybe with the earth side being the side used for equipment? Idk.
A radio telescope would perform best if it was shielded by the moon.
From memory, that sunshade needs to be many orders of magnitude bigger than any telescope.
Which probably means it would have to be a "cloud" of millions of smaller shades.
If enough of a star's light can be blocked by polarized filters, data transmission can occur when they are switched on and off in a pattern. Maybe with the JWST we'll be able to download many different civilizations' Wikipedias if they're blinking their suns at us.