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italy_wildfires_36424.jpg

italy_wildfires_36424.jpg

Sun sets over burnt trees of the Castelfusano pine forest, near Rome, Italy, Tuesday, July 18, 2017. Wildfires have been ravaging swaths of Italy, mostly in the south, where the Coldiretti agricultural lobby says July rain levels were down 83 percent while temperatures were around 3 degrees Celsius higher. (Massimo Percossi/ANSA via AP)

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portugal_forest_fires_73222.jpg

FILE- In this Sunday, June 18, 2017, file photo, Portuguese firefighters work to stop a forest fire from reaching the village of Figueiro dos Vinhos in central Portugal. Portuguese lawmakers agreed Wednesday, July 19, 2017, on new measures to help contain the fires that race through the country's forests each summer, after one wildfire last month that killed 64 people. (AP Photo/Paulo Duarte, file)

italy_wildfires_43944.jpg

italy_wildfires_43944.jpg

Burnt trees are pictured in the Castelfusano pine forest, near Rome, Italy, Wednesday, July 19, 2017. Wildfires have been ravaging swaths of Italy, mostly in the south, where the Coldiretti agricultural lobby says July rain levels were down 83 percent while temperatures were around 3 degrees Celsius higher. (Massimo Percossi/ANSA via AP)

italy_wildfires_46629.jpg

italy_wildfires_46629.jpg

Burnt trees are pictured in the Castelfusano pine forest, near Rome, Italy, Wednesday, July 19, 2017. Wildfires have been ravaging swaths of Italy, mostly in the south, where the Coldiretti agricultural lobby says July rain levels were down 83 percent while temperatures were around 3 degrees Celsius higher. (Massimo Percossi/ANSA via AP)

california_dirty_air_10306.jpg

california_dirty_air_10306.jpg

In this June 23, 2017 photo, trains are lined up near a section of Highway 99 in Fresno, Calif. California’s vast San Joaquin Valley, the country’s most productive farming region, is engulfed by some of the nation’s dirtiest skies, forcing the state’s largest air district to spend more than $40 billion in the past quarter-century to enforce hundreds of stringent pollution rules. The investment has steadily driven down the number of days with unhealthy air - but on hot, windless days, a brown haze still hangs overhead, sending wheezing people with tight chests to emergency rooms and hundreds each year to an early grave. (AP Photo/Gary Kazanjian)

california_dirty_air_70836.jpg

california_dirty_air_70836.jpg

In this May 3, 2017 photo, staffers of the San Joaquin Valley Air Pollution Control District check equipment in Clovis, Calif., at one of several stations used to monitor the air quality. The vast San Joaquin Valley in California, the country's most fertile farming region, is engulfed by some of the nation's dirtiest air. The poor air quality is the byproduct of booming farms, oil production near Bakersfield, two major highways, a web of rail lines and the valley's bowl-shaped geography. (AP Photo/Scott Smith)

california_dirty_air_84538.jpg

california_dirty_air_84538.jpg

In this May 3, 2017 photo, equipment operated by the San Joaquin Valley Air Pollution Control District checks air quality in Clovis, Calif., at one of several stations used by the district. The vast San Joaquin Valley in California, the country's most fertile farming region, is engulfed by some of the nation's dirtiest air. The poor air quality is the byproduct of booming farms, oil production near Bakersfield, two major highways, a web of rail lines and the valley's bowl-shaped geography. (AP Photo/Scott Smith)

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california_dirty_air_18409.jpg

In this April 4, 2017 photo, Natalie Sua helps two of her children, Javier, left, and Ezekiel who suffer with asthma, do their homework at their home in Fresno, Calif. Both sons use inhalers to combat asthma, made worse by air pollution in the San Joaquin Valley. On the worst days, Sua keeps her children inside, when they would rather be rough-housing on their backyard trampoline, but the risks are too high. Hundreds of people each year in the San Joaquin Valley die premature deaths from poor air quality. (AP Photo/Scott Smith)

california_dirty_air_20854.jpg

california_dirty_air_20854.jpg

In this June 23, 2017 photo, cars and trucks roll along a section of Highway 99 during rush hour that's being worked on for the high speed rail in Fresno, Calif. California's vast San Joaquin Valley, the country's most fertile farming region, is engulfed by some of the nation's dirtiest air. On hot, windless days, a brown haze hangs overhead, sending wheezing people with tight chests to emergency rooms, and hundreds each year to an early grave. To combat the problem, California's biggest air district has spent more than $40 billion in the last quarter century to enforce hundreds of pollution rules and has driven down the number of unhealthy days by 80 percent, according to an Associated Press analysis. (AP Photo/Gary Kazanjian)

california_dirty_air_39130.jpg

california_dirty_air_39130.jpg

In this June 23, 2017 photo, cars and trucks roll along a section of Blackstone Ave. during rush hour in Fresno, Calif. California's vast San Joaquin Valley, the country's most fertile farming region, is engulfed by some of the nation's dirtiest air. On hot, windless days, a brown haze hangs overhead, sending wheezing people with tight chests to emergency rooms, and hundreds each year to an early grave. To combat the problem, California's biggest air district has spent more than $40 billion in the last quarter century to enforce hundreds of pollution rules and has driven down the number of unhealthy days by 80 percent, according to an Associated Press analysis. (AP Photo/Gary Kazanjian)

california_dirty_air_53613.jpg

california_dirty_air_53613.jpg

In this June 8, 2017 photo, oil derricks are busy pumping as the moon rises near the La Paloma Generating Station in McKittrick, Calif. California’s vast San Joaquin Valley, the country’s most productive farming region, is engulfed by some of the nation’s dirtiest skies, forcing the state’s largest air district to spend more than $40 billion in the past quarter-century to enforce hundreds of stringent pollution rules. Its bad air is the byproduct of booming farms, oil production, two major highways, a web of rail lines - and the valley’s bowl-shaped geography. (AP Photo/Gary Kazanjian)

california_dirty_air_33653.jpg

california_dirty_air_33653.jpg

In this April 3, 2017 photo, dairy cows stand in a pen in Fresno County, Calif. California's vast San Joaquin Valley, the country's most fertile farming region, is engulfed by some of the nation's dirtiest air. Its bad air is the byproduct of booming farms, oil production, two major highways, a web of rail lines - and the valley’s bowl-shaped geography. (AP Photo/Scott Smith)

california_dirty_air_76201.jpg

california_dirty_air_76201.jpg

In this photo April 4, 2017 photo, Javier Sua demonstrates how he uses an inhaler at his home in Fresno, Calif. He uses it to combat asthma, made worse by air pollution in the San Joaquin Valley. On some days, his mother keeps him inside, when he would rather be rough-housing on the backyard trampoline, but the risks are too high. Hundreds of people each year in the San Joaquin Valley die premature deaths from poor air quality. (AP Photo/Scott Smith)

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arizona-flood_98725.jpg

Hector Garnica worked at the Horny Toad, a restaurant in Cave Creek, Ariz., on and off for eight years. Garnica remains missing Wednesday, July 19, 2017, while his wife and three children were some of nine family members confirmed dead when a flash flood ravaged a river in Tonto National Forest. (AP Photo/Angie Wang)

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mexico_floating_farm_to_table_85127.jpg

In this June 27, 2017 photo, birds skim the channels of Xochimilco in Mexico City. Xochimilco, on the far southern edge of Mexico City, is best-known as the “Mexican Venice” for its canals and brightly colored boats is designated by UNESCO as a World Heritage site. (AP Photo/Marco Ugarte)

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mexico_floating_farm_to_table_39235.jpg

In this July 13, 2017, a farmer moves his harvest of squash flowers through the channels of Xochimilco in Mexico City. Xochimilco is designated by UNESCO as a World Heritage site. (AP Photo / Marco Ugarte)

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mexico_floating_farm_to_table_36471.jpg

In this July 13, 2017 photo, a farmer takes advantage of a motorized boat to move faster along the channels of Xochimilco to his floating farm known as a "chinampa" in Mexico City. Xochimilco, on the far southern edge of Mexico City, has been a breadbasket for the Valley of Mexico since before the Aztec Empire, when farmers first created the “floating” islands bound to the shallow canal beds through layers of sediment and willow roots. (AP Photo/Marco Ugarte)

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mexico_floating_farm_to_table_75440.jpg

In this July 13, 2017 photo, men remove mud from a shallow channel so that tourist boats will be able to move through the channel, in Xochimilco, Mexico City. Some of Mexico City’s most in-demand restaurants are increasingly incorporating produce grown at the famed aquatic gardens of Xochimilco (AP Photo/Marco Ugarte)

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mexico_floating_farm_to_table_74638.jpg

In this July 13, 2017 photo, a farmer's machete and hat sit on a floating farm known as a "chinampa" in Xochimilco, Mexico City. The World Heritage status and Xochimilco itself are threatened by the pollution and encroaching urbanization that plague the rest of the sprawling metropolis. (AP Photo / Marco Ugarte)

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mexico_floating_farm_to_table_75046.jpg

In this July 13, 2017 photo, a farmer paddles his canoe to his floating farm known as a "chinampa," in Xochimilco, Mexico City. Xochimilco is designated by UNESCO as a World Heritage site. (AP Photo/Marco Ugarte)