Climate Changes Make Extreme Winter

According to a new study, climate change might be off the table as the reason when it comes to the abnormally cold winters we have seen in recent years. Global warming leads to more extreme weather. Green groups declare that “extreme weather is a product of climate change.”
A team of scientists from Swiss university ETH Zurich and the California Institute of Technology say that climate change does not cause cold snaps. A warmer climate will mean a lower range of temperature fluctuation and increasingly rare cold snaps.
The study in the Journal of Climate says overturns the previous hypothesis that the warming Arctic is weakening the polar jet stream, which in turn leads to higher temperature variability and harsher winter seasons.
The Intergovernmental Panel on Climate Change (IPCC) came to similar conclusions about wintertime temperature variability with its own climate simulations. 

On the other hand, it may not be the reason behind extreme winters; climate change will continue to heat up the Earth. 
Scientist also says that, "Despite lower temperature variance, there will be more extreme warm periods in the future because the Earth is warming,"
The National Oceanic and Atmospheric Administration officially declared that the year 2014 was the hottest year on record. The study leader Tapio Schneider says, “The waviness of the jet stream that makes our day-to-day weather does not change much."  According to another theory smog from Asia is worsening storms over the Pacific Ocean and possibly caused to colder winters.
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