A word used to describe the principle of taking action before problems become insurmountable or opportunities are lost, which standing outside the context of that principle, does not exist in any dictionary except this one.
The idea that if the consequences are unknown and may cause harm or negativeconsequences, it is best to avoid making that decision or to proceed with caution.
Since the effect of CO2 emissions on the climate is still unclear, it is best to use the precautionary principle.