Thousands of people demonstrate at Rise for Climate event in San Francisco

Best friends, Kelly Li (left) and Fiona Yu, played with the Chinese Progressive Association, a workers' rights campaign based in San Francisco's Chinatown, during the March for Climate, Jobs and justice. World Summit on Climate Action, Wednesday 12 September.

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People attend the "Rise for Climate, Jobs and Justice" rally at Embarcadero Plaza in San Francisco. Thousands of people marched through the streets of San Francisco just days before the World Climate Summit on Wednesday.

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Dinamam Tuxá, with Articulation of the Indigenous Peoples of Brazil, sings while he participates in the March for Climate, Employment and Justice on Market Street in San Francisco.

Thousands of people travel to San Francisco as part of a global initiative involving more than 800 events in about 90 countries, demanding a transition to renewable energy.

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Xochitl Johnson, with the Revolution Club Bay Area, speaks at the Rise for Climate Rally at Embarcadero Plaza.

Daniel Johnson of San Francisco attends the RISE Parade for Climate, Employment and Justice, which kicks off at Embarcadero Plaza on Saturday, September 8, 2018 in San Francisco, California. Thousands of people marched through the streets of San Francisco the World Summit on Climate Action next week. Less

Click on the slide show to see how climate change affects different cities and regions of the United States.

1. Alaska

The significant increase in the activity of wildfires in Alaska in recent decades is associated with factors of human and natural origin. A special Climate Science report estimates that the risk of devastating forest fires in the state has probably increased from 33% to 50% and is expected to quadruple by the end of the 21st century. The 2015 fire season in Alaska has burned the second largest number of acres since 1940, the year when record keeping began.

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2. Arctic Ocean: Alaska

The amount of sea ice in the Bering and Chukotka seas, which separate Alaska from Asia, fell to 135,000 square miles last November, the lowest level in 40 years.

3. Arizona: Phoenix

At the end of June 2017, Phoenix, Arizona – still among the hottest cities in the country – recorded a high temperature of at least 112 degrees for nine consecutive days, a historic record set in 1990, according to the National Weather Service.

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4. Central Pacific: Near Hawaii

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5. Oklahoma

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6. East Coast of North America: Pittsburgh, Cincinnati, Indianapolis, Charlestown

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7. East Coast of North America: Maryland

On May 27, torrential rains west of Baltimore dumped up to 10 inches of rain over the city of Catonsville, Maryland. According to historical data, rainfall of such intensity occur every 500 years. Such extreme weather events are associated with climate change.

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8. Mid-Atlantic: from Arkansas to Massachusetts

In January 2016, a colossal blizzard hit 100 million people, from Arkansas to Massachusetts. The storm dumped 20 inches of snow or more on 21 million people. According to the regional snowfall index, the blizzard has been ranked fourth since 1900. According to some scientists, the blizzard is an example of man-made climate change, as it was from an extreme weather event.

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9. Northeastern United States

According to the National Climate Assessment, the amount of rain falling in the 1% of the largest storms in the United States has increased over the last century. These extreme weather events are associated with climate change of human origin. The largest increases occurred in the northeast, the Great Plains, the Midwest and the Southeast. In these areas, more than 30% of precipitation exceeded the average of 1901-1960.

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10. Southwestern United States: California, Arizona, Nevada

Drought intensified in the southwestern United States in early spring. The Rio Grande fish had to be moved and farmers from the Middle Rio Grande in New Mexico were asked to wait for half of their irrigation quota.

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11. US West Coast: California

After the second driest winter ever recorded, the rain flooded California in March, one of the wettest walks in the state. California usually receives most of its rains in winter. Scientists at the University of California, Riverside, predict that the state will receive an average of 12% more precipitation by the end of the century, compared to the last 20 years of the 20th century. They attribute this to warmer sea surface temperatures in the tropical eastern Pacific Ocean.

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12. Western United States: Colorado, Utah, Caliornia

The snowpack in the western states was considerably lower last winter. In mid-February, state-wide snowfall fell 85 percent in Colorado. Scientists say that the amount of snow accumulated has decreased over the last 50 years.

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13. Western United States: California

California suffered from a prolonged drought that began to hit the country in 2012. Agricultural production has dropped, crop prices have doubled and wells have dried up a year when July was hottest in the USA.

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14. Western United States

Spring melting has been faster in 2017 in the United States than the average of the past 30 years. Scientists say that because of climate change caused by humans, spring begins about 2.5 days earlier each decade.

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15. Western United States

Heat waves in the United States have become more frequent since the 1960s, when extremely cold temperatures and cold spells were less frequent, according to a CSSR report. The annual average temperature over the contiguous United States increased by 1.8 degrees Fahrenheit for the period from 1901 to 2016.

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16. Northeastern United States: Pennsylvania, New York, New Jersey

According to data from the Environmental Protection Agency, flooding has increased in rivers and streams in many parts of the north-east of the country from 1965 to 2015. Major floods have become more frequent in the north. -East.

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17. Pacific Northwest: Washington State Coast

According to data obtained from the EPA, flooding has increased in rivers and streams in many parts of the northwest from 1965 to 2015. Large floods have also become more prevalent in the Pacific Northwest. Frequent flooding forced Hoh Native Americans to leave their reserve in Washington State and moved to higher areas.

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18. Northern Midwest: Illinois, Ohio, Indiana

According to data obtained from the EPA, flooding has increased in rivers and streams in many Midwestern areas from 1965 to 2015. Large floods have permeated the region in 1993, 2008, 2011, 2013 and 2014.

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19. South Florida

According to the NOAA study, Florida's daily water levels during the tides, the highest tides of the year, increased between 1994 and 2017. The report indicates that the number of tides has not increased, but the level of water has increased since 1994.

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20. Southwest: 4-Corners area

A long dry season in the southwest resulted in little precipitation and no measurable snowfall over much of the region in January. Arizona was particularly arid. Drought problems in this state began in October. At the beginning of the month, 11% of Arizona was in drought. By the end of October, 40% of Arizona was in drought. Snow levels were below average in Sierra Nevada and the Rockies. Higher than normal pressure contributed to prolonged drought, which resulted in lack of moisture.

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