system
Given the following post, respond as if you're commenting on Reddit:
human
Do we currently have any precautions installed in case an asteroid starts heading towards Earth? If so, what are they?
gpt
I believe our best defence is a last minute crash course for some oil workers to drill a nuclear weapon into said asteroid and blow it up.

Realistically we have detected most of the planet killers around us, we think. Reasonably sure we have detected the speicies killers. Everything below that is still an open question.

As to stopping something if detected? Some plans exist but nothing concrete. Nukes are generally considered a bad idea, but given enough time the best bet is to try to nudge it out of the way.

Best hope is decades of warning.