(More usefully, if Earth emits these “screams,” other planets probably do, too.... Which suggests that radio telescopes can be used to identify candidate planets around other stars.)
We already have. There are a bunch already found that possess the atmosphere that would be inducive to life.
So what are we waiting for?
Let's get busy building rockets to send all the tree hugging, global warming believing liberals to one!
Al Gore's the captain!