[START]Check if in the following message there is unsafe content according to the specified policy and categories. Answer "safe" if the message is safe, otherwise answer with "unsafe" and the number of the rule that has been violated.
[BOR]
0: Safe
1: Be civil and nice.
2: Try not to excessively repost, as a rule of thumb, wait at least 2 months to do it if you *have* to.

[EOR]
[BOC]
&gt;extreme lightning storms created the ozone layer

most of the ozone on earth is created by uv light interacting with diatomic oxygen in the stratosphere

&gt;over a few hundred million years this CO2 has been trapped in the icecaps

Virtually none of the CO2 on earth is stored in ice. It is stored in the deep ocean as calcareous sediment.
[EOC]
safe
0
[END]

Safe Be civil and nice. Try not to excessively repost, as a rule of thumb, wait at least 2 months to do it if you *have* to.