Query: The human contribution can be up to 30 percent or so of the total rainfall coming out of the storm

Relevant passages:
Physical impacts of climate change <=SEP=> This article is about the physical impacts of climate change . For some of these physical impacts , their effect on social and economic systems are also described .   This article refers to reports produced by the IPCC . In their usage , `` climate change '' refers to a change in the state of the climate that can be identified by changes in the mean and/or variability of its properties , and that persists for extended periods , typically decades or longer ( IPCC , 2007d :30 ) . The climate change referred to may be due to natural causes and/or the result of human activity .

Urban heat island <=SEP=> An urban heat island ( UHI ) is an urban area or metropolitan area that is significantly warmer than its surrounding rural areas due to human activities . The temperature difference usually is larger at night than during the day , and is most apparent when winds are weak . UHI is most noticeable during the summer and winter . The main cause of the urban heat island effect is from the modification of land surfaces . Waste heat generated by energy usage is a secondary contributor . As a population center grows , it tends to expand its area and increase its average temperature . The less-used term heat island refers to any area , populated or not , which is consistently hotter than the surrounding area .   Monthly rainfall is greater downwind of cities , partially due to the UHI . Increases in heat within urban centers increases the length of growing seasons , and decreases the occurrence of weak tornadoes . The UHI decreases air quality by increasing the production of pollutants such as ozone , and decreases water quality as warmer waters flow into area streams and put stress on their ecosystems .   Not all cities have a distinct urban heat island . Mitigation of the urban heat island effect can be accomplished through the use of green roofs and the use of lighter-colored surfaces in urban areas , which reflect more sunlight and absorb less heat .   There are concerns raised about possible contribution from urban heat islands to global warming . Research on China and India indicates that urban heat island effect contributes to climate warming by about 30 % . On the other hand , one 1999 comparison between urban and rural areas proposed that the urban heat island effects have little influence on global mean temperature trends . Many studies reveal increases in the severity of the effect with the progress of climate change .

Puerto Rico <=SEP=> Puerto Rico ( Spanish for `` Rich Port '' ) , officially the Commonwealth of Puerto Rico ( Estado Libre Asociado de Puerto Rico , `` Free Associated State of Puerto Rico '' ) and briefly called Porto Rico , is an unincorporated territory of the United States located in the northeast Caribbean Sea .   It is an archipelago that includes the main island of Puerto Rico and a number of smaller ones such as Mona , Culebra , and Vieques . The capital and most populous city is San Juan . Its official languages are Spanish and English , though Spanish predominates . The island 's population is approximately 3.4 million . Puerto Rico 's rich history , tropical climate , diverse natural scenery , traditional cuisine , and attractive tax incentives make it a popular destination for travelers from around the world .   Originally populated by the indigenous Taíno people , the island was claimed in 1493 by Christopher Columbus for the Crown of Castile , and it later endured invasion attempts from the French , Dutch , and British . Four centuries of Spanish colonial government transformed the island 's ethnic , cultural and physical landscapes primarily with waves of African slaves , and Canarian , and Andalusian settlers . In the Spanish imperial imagination , Puerto Rico played a secondary , but strategic role when compared to wealthier colonies like Peru and Mexico . Such a distant administrative control continued right up until the end of the 19th century helping to produce a distinctive creole Hispanic culture and language that combined elements from the Natives , Africans , and Iberian people . In 1898 , following the Spanish -- American War , the United States appropriated Puerto Rico together with most former Spanish colonies under the terms of the Treaty of Paris .   Puerto Ricans are considered natural-born citizens of the United States . However , Puerto Rico does not have a vote in the United States Congress , which governs the territory with full jurisdiction under the Puerto Rico Federal Relations Act of 1950 . As a U.S. territory , American citizens residing on the island are disenfranchised at the national level and may not vote for president and vice president of the United States . However , Congress approved a local constitution , allowing U.S. citizens on the territory to elect a governor . A 2012 referendum showed a majority ( 54 % of those who voted ) disagreed with `` the present form of territorial status '' , with full statehood as the preferred option among those who voted for a change of status , although a significant number of people did not answer the second question from the referendum . A fifth referendum will be held in June 2017 , and `` Statehood '' and `` Independence/Free Association '' were initially the only available options . However , at the recommendation of the Department of Justice , a `` current territorial status '' option will be added .   In early 2017 , the Puerto Rican government-debt crisis posed serious problems for the government . The outstanding bond debt had climbed to $ 70 billion at a time with 12.4 % unemployment . The debt had been increasing during a decade long recession . This was the second major financial crisis to affect the island after the Great Depression when the U.S. government , in 1935 , provided relief efforts through the Puerto Rico Reconstruction Administration . On May 3 , 2017 , Puerto Rico 's financial oversight board in the U.S. District Court in Puerto Rico filed the debt restructuring petition which was made under Title III of PROMESA .

Saudi Arabia <=SEP=> Saudi Arabia ( -LSB- saʊ - -RSB- ) , officially the Kingdom of Saudi Arabia ( KSA ) , is an Arab sovereign state in Western Asia constituting the bulk of the Arabian Peninsula .  With a land area of approximately , Saudi Arabia is geographically the fifth-largest state in Asia and second-largest state in the Arab world after Algeria . Saudi Arabia is bordered by Jordan and Iraq to the north , Kuwait to the northeast , Qatar , Bahrain and the United Arab Emirates to the east , Oman to the southeast and Yemen to the south . It is separated from Israel and Egypt by the Gulf of Aqaba . It is the only nation with both a Red Sea coast and a Persian Gulf coast and most of its terrain consists of arid desert and mountains .   The area of modern-day Saudi Arabia formerly consisted of four distinct regions : Hejaz , Najd and parts of Eastern Arabia ( Al-Ahsa ) and Southern Arabia ( ` Asir ) . The Kingdom of Saudi Arabia was founded in 1932 by Ibn Saud . He united the four regions into a single state through a series of conquests beginning in 1902 with the capture of Riyadh , the ancestral home of his family , the House of Saud . Saudi Arabia has since been an absolute monarchy , effectively a hereditary dictatorship governed along Islamic lines . The ultraconservative Wahhabi religious movement within Sunni Islam has been called `` the predominant feature of Saudi culture '' , with its global spread largely financed by the oil and gas trade . Saudi Arabia is sometimes called `` the Land of the Two Holy Mosques '' in reference to Al-Masjid al-Haram ( in Mecca ) and Al-Masjid an-Nabawi ( in Medina ) , the two holiest places in Islam . The state has a total population of 28.7 million , of which 20 million are Saudi nationals and 8 million are foreigners . The state 's official language is Arabic .   Petroleum was discovered on 3 March 1938 and followed up by several other finds in the Eastern Province . Saudi Arabia has since become the world 's largest oil producer and exporter , controlling the world 's second largest oil reserves and the sixth largest gas reserves . The kingdom is categorized as a World Bank high-income economy with a high Human Development Index and is the only Arab country to be part of the G-20 major economies . However , the economy of Saudi Arabia is the least diversified in the Gulf Cooperation Council , lacking any significant service or production sector ( apart from the extraction of resources ) . The state has attracted criticism for its treatment of women and use of capital punishment . Saudi Arabia is a monarchical autocracy , has the fourth highest military expenditure in the world and SIPRI found that Saudi Arabia was the world 's second largest arms importer in 2010 -- 2014 . Saudi Arabia is considered a regional and middle power . In addition to the GCC , it is an active member of the Organisation of Islamic Cooperation and OPEC .