The warmth of February brought by climate change.

On February 8, 20 17, pedestrians and cyclists crossed the Brooklyn Bridge in New York, where the temperature reached 60 degrees Fahrenheit (16 degrees Celsius). Drewinger/Getty Images There were a lot of high temperature records in almost all parts of the United States in February, and the research released on Wednesday showed that this universal spring-like warmth was caused by climate change.

The rise of planetary heat increases the possibility of abnormal warm weather in February by 13 times. According to the analysis of scientists of the World Weather Attribution Group, compared with 120 years ago. Although it will take another month to remember, by the middle of this century, unless carbon pollution is reduced, this craze will appear every three years. ECMWF analysis and comparison era 198 1-20 10. More and more evidence shows that climate change plays an important role in almost all extreme high temperature events, and the "warm period" is only the latest part. Winter is the fastest season in America, and February is no exception. Especially since 1895, the temperature in February has increased by 3 degrees Fahrenheit, which is about twice the global average temperature. In February this year

Just in line with this trend. According to the National Environmental Information Center, it is the second hottest city in the United States on record, after 1954. The average temperature in February in the United States was 7.3 degrees Fahrenheit higher than normal, making it the fifth unusually warm month on record. From Texas to new york, there are 16 states with the hottest February on record.

Extreme heat is defining climate change. Most parts of the United States have experienced a crazy warm winter, and the United States is ready to set a record.

Two-thirds of the eastern United States, from one border to another, have drawn weather maps in red. Almost the whole February (and winter), only the Pacific Northwest was below average temperature. The high temperature pushed the ratio of the highest and lowest daily values to a record level and accelerated the arrival of spring in some areas, which lasted for four weeks.

Scientists use historical data and climate models to understand what caused the high temperature. Historical observation shows that this continuous high temperature occurs once every 1900 years, but under our current climate conditions, it is now once every 12 years. They combed out the specific role of climate change through the model and found that it increased the possibility of blazing at least three times.

If the world continues to maintain the current rate of greenhouse gas emissions, such February may become the norm by 2050. In February, all over the United States

Temperature ranking. (NOAA NCEI) "Our research shows that this kind of heat has become more and more common, and it will become more and more common in the future," said andrew kim, a researcher at Melbourne's ARC Climate System Science Center of Excellence and one of the authors of the report.

Although the research results have not been peer reviewed, this analysis adopts the method of peer review, which has been widely used in previous attribution studies. Most of these studies show that climate change is driving extreme high temperature events around the world.

"We found that we can associate unusually warm weather events with climate change," Jin said, adding that it is almost certain that climate change has played a role in almost all extreme high temperatures in "most parts of the world".

"I know that in other studies of winter high temperature events in the United States, the probability has also changed greatly, so it is not surprising," said Martin Holling, a climate scientist at the Earth System Research Laboratory.

He said that although the research results are consistent with climate change, there is one thing to pay attention to. Although the temperature in February rose by 3 degrees Fahrenheit, most of the increase was in the early stage of the temperature record. In contrast, in the second year, global warming was rapid.