I'm shamelessly copy-pasting from my previous comment.

When the aliens arrive years from now, what sort of impression do we want to make? “They just gave up” or “They fought until the very end”? In the end it doesn’t matter whether the climate is salvageable or not. What matters is our resolve. If we all assume we can do nothing to change our situation, then nothing will change.

Feel free to use this copypasta for future doomerposts.