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New Zealand Prime Minister Jacinda Ardern gestures while speaking at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

New Zealand Prime Minister Jacinda Ardern gestures while speaking at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern laugh while posing in a group photo after an event at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." At lower left is California Lt. Gov. Eleni Kounalakis. (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern laugh while posing in a group photo after an event at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." At lower left is California Lt. Gov. Eleni Kounalakis. (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern take questions after an event at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern take questions after an event at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom speaks during an event at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom speaks during an event at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern pose with agreements they signed at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Gov. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern pose with agreements they signed at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Gov. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

New Zealand Prime Minister Jacinda Ardern gestures toward a tree behind her while speaking at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Gov. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

New Zealand Prime Minister Jacinda Ardern gestures toward a tree behind her while speaking at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Gov. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern pose for pictures by a tree after an event at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern pose for pictures by a tree after an event at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern walk together through the San Francisco Botanical Garden at Golden Gate Park in San Francisco, Friday, May 27, 2022. Gov. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern walk together through the San Francisco Botanical Garden at Golden Gate Park in San Francisco, Friday, May 27, 2022. Gov. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern walk together through the San Francisco Botanical Garden at Golden Gate Park in San Francisco, Friday, May 27, 2022. Gov. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern walk together through the San Francisco Botanical Garden at Golden Gate Park in San Francisco, Friday, May 27, 2022. Gov. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern prepare to take questions after an event at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Gov. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)

California Gov. Gavin Newsom and New Zealand Prime Minister Jacinda Ardern prepare to take questions after an event at the San Francisco Botanical Garden in San Francisco, Friday, May 27, 2022. Gov. Newsom met with Ardern in Golden Gate Park "to establish a new international partnership tackling climate change." (AP Photo/Eric Risberg)