The changing climate was happening due to the high quanlity of CO2 and poisons that people are releasing to the environments. Mother natural can't take it anymore and punish back to the human.
Carbon dioxide is the primary reason for global warming. But everyone is ignoring another major culprit, that is methane. Methane in same quantity as CO2 causes almost 1,000 times the global warming as CO2 does. Fortunately for us, methane is only produced at very low levels. But the polar thawing can change everything. Methane trapped in the permafrost can be released in to the atmosphere.