> CO2 isn't the only greenhouse gas, or anywhere near the most powerful. There are immense reserves of methane gas frozen under the arctic. If that gas were sud

> CO2 isn't the only greenhouse gas, or anywhere near the most powerful. There are immense reserves of methane gas frozen under the arctic. If that gas were suddenly released all at once due to the ice caps melting, it could be truly catastrophic. Yes, true, with one mitigating factor -- methane doesn't stay in the atmosphere very long. It breaks down fairly rapidly. It's a much more efficient greenhouse gas than CO2, but it's short-lived.