1.
Tuvalu
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It comprises three reef islands and six true atolls spread out between the latitude of 5° to 10° south and longitude of 176° to 180°, west of the International Date Line. Tuvalu has a population of 10,640, the total land area of the islands of Tuvalu is 26 square kilometres. The first inhabitants of Tuvalu were Polynesians, in 1568, Spanish navigator Álvaro de Mendaña was the first European to sail through the archipelago, sighting the island of Nui during his expedition in search of Terra Australis. In 1819 the island of Funafuti was named Ellices Island, the name Ellice was applied to all nine islands after the work of English hydrographer Alexander George Findlay. A referendum was held in December 1974 to determine whether the Gilbert Islands, as a consequence of the referendum, the Gilbert and Ellice Islands colony ceased to exist on 1 January 1976 and the separate British colonies of Kiribati and Tuvalu came into existence. Tuvalu became fully independent within the Commonwealth on 1 October 1978, on 5 September 2000 Tuvalu became the 189th member of the United Nations. The origins of the people of Tuvalu are addressed in the theories regarding migration into the Pacific that began about 3000 years ago, during pre-European-contact times there was frequent canoe voyaging between the nearer islands including Samoa and Tonga. Eight of the nine islands of Tuvalu were inhabited, thus the name, Tuvalu, possible evidence of fire in the Caves of Nanumanga may indicate human occupation for thousands of years. The stories as to the ancestors of the Tuvaluans vary from island to island, on Niutao, Funafuti and Vaitupu the founding ancestor is described as being from Samoa, whereas on Nanumea the founding ancestor is described as being from Tonga. Mendaña made contact with the islanders but was unable to land, during Mendañas second voyage across the Pacific he passed Niulakita on 29 August 1595, which he named La Solitaria. Captain John Byron passed through the islands of Tuvalu in 1764 during his circumnavigation of the globe as captain of the Dolphin, Byron charted the atolls as Lagoon Islands. Chambers and Doug Munro identified Niutao as the island that Francisco Mourelle de la Rúa sailed past on 5 May 1781, mourelles map and journal named the island El Gran Cocal, however, the latitude and longitude was uncertain. Longitude could only be reckoned crudely as accurate chronometers were unavailable until the late 18th century, the name Ellice was applied to all nine islands after the work of English hydrographer Alexander George Findlay. In 1820 the Russian explorer Mikhail Lazarev visited Nukufetau as commander of the Mirny, Louis Isidore Duperrey, captain of La Coquille, sailed past Nanumanga in May 1824 during a circumnavigation of the earth. A Dutch expedition found Nui on the morning of 14 June 1825, whalers began roving the Pacific, although visiting Tuvalu only infrequently because of the difficulties of landing on the atolls. Captain George Barrett of the Nantucket whaler Independence II has been identified as the first whaler to hunt the waters around Tuvalu, in November 1821 he bartered coconuts from the people of Nukulaelae and also visited Niulakita. A shore camp was established on Sakalua islet of Nukufetau, where coal was used to melt down the whale blubber, the Rev. A. W. Elekana began proselytising Christianity. He was trained at Malua Theological College, a London Missionary Society school in Samoa, in 1865 the Rev. A. W. Murray of the LMS – a Protestant congregationalist missionary society – arrived as the first European missionary where he too proselytised among the inhabitants of Tuvalu
2.
Climate change in Tuvalu
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Global warming is a concern in Tuvalu since the average height of the islands is less than 2 metres above sea level, with the highest point of Niulakita being about 4.6 metres above sea level. Tuvalu could be one of the first nations to experience the effects of sea level rise, not only could parts of the island be flooded but the rising saltwater table could also destroy deep rooted food crops such as coconut, pulaka, and taro. Tuvalu participates in the operations of the Secretariat of the Pacific Regional Environment Programme, the climate of the Pacific region at the equator is influenced by a number of factors, the science of which is the subject of continuing research. The SPREP described the climate of Tuvalu as being, The sea level in Tuvalu varies as a consequence of a range of atmospheric and oceanographic influences. The trade winds that push surface water westward create this zonal tilting of sea level on the equator, below the equator a higher sea level can also be found about 20° to 40° south. This has an effect on sea levels, the Perigean spring tide can result in seawater flooding low-lying areas of the islands of Tuvalu. In 1978 a tide gauge was installed at Funafuti by the University of Hawaii. It has measured a sea rise of 1.2 mm per year over 23 years—a figure consistent with the Intergovernmental Panel on Climate Change global mean estimate of 1 to 2 mm per year over the 20th century. The 40 cm rise in sea level predicted by the IPCC by the end of the 21st century could have significant effects for Tuvalu, the highest elevation is 4.6 metres above sea level on Niulakita, which gives Tuvalu the second-lowest maximum elevation of any country. However, the highest elevations are typically in narrow storm dunes on the side of the islands which are prone to over topping in tropical cyclones. In March 2015 the storm created by Cyclone Pam resulted in waves of 3 metres to 5 metres breaking over the reef of the outer islands caused damage to houses, crops. On Nui the sources of water were destroyed or contaminated. Tuvalu is also affected by spring tide events, which raise the sea level higher than a normal high tide. The highest peak tide recorded by the Tuvalu Meteorological Service was 3.4 metres on 24 February 2006 and again on 19 February 2015. In the future, sea level rise may threaten to submerge the nation entirely as it is estimated that a sea rise of 20–40 centimetres in the next 100 years could make Tuvalu uninhabitable. There remains the risk that the response of atolls and reef islands does not result in stable islands as tropical cyclones can strip the low-lying islands of their vegetation. Tepuka Vili Vili islet of Funafuti atoll was devastated by Cyclone Meli in 1979, with all its vegetation, vasafua islet, part of the Funafuti Conservation Area, was severely damaged by Cyclone Pam in 2015. The coconut palms were washed away, leaving the islet as a sand bar, gradual sea-level rise also allows for coral polyp activity to raise the atolls with the sea level
3.
Drought
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A drought is a period of below-average precipitation in a given region, resulting in prolonged shortages in its water supply, whether atmospheric, surface water or ground water. A drought can last for months or years, or may be declared after as few as 15 days and it can have a substantial impact on the ecosystem and agriculture of the affected region and harm to the local economy. Annual dry seasons in the tropics significantly increase the chances of a drought developing, periods of heat can significantly worsen drought conditions by hastening evaporation of water vapour. Many plant species, such as those in the family Cactaceae, have drought tolerance adaptations like reduced leaf area, some others survive dry periods as buried seeds. Semi-permanent drought produces arid biomes such as deserts and grasslands, prolonged droughts have caused mass migrations and humanitarian crises. Most arid ecosystems have inherently low productivity, the most prolonged drought ever in the world in recorded history occurred in the Atacama Desert in Chile. Mechanisms of producing precipitation include convective, stratiform, and orographic rainfall, precipitation can be divided into three categories, based on whether it falls as liquid water, liquid water that freezes on contact with the surface, or ice. Drought are mainly course by in low rain areas, if these factors do not support precipitation volumes sufficient to reach the surface over a sufficient time, the result is a drought. Once a region is within drought, feedback mechanisms such as local arid air, hot conditions which can promote warm core ridging, within the tropics, distinct, wet and dry seasons emerge due to the movement of the Intertropical Convergence Zone or Monsoon trough. The dry season greatly increases drought occurrence, and is characterized by its low humidity, with watering holes, because of the lack of these watering holes, many grazing animals are forced to migrate due to the lack of water and feed to more fertile spots. Examples of such animals are zebras, elephants, and wildebeest, because of the lack of water in the plants, bushfires are common. Since water vapor becomes more energetic with increasing temperature, more water vapor is required to increase relative humidity values to 100% at higher temperatures, periods of warmth quicken the pace of fruit and vegetable production, increase evaporation and transpiration from plants, and worsen drought conditions. Drier and hotter weather occurs in parts of the Amazon River Basin, Colombia, winters during the El Niño are warmer and drier than average conditions in the Northwest, northern Midwest, and northern Mideast United States, so those regions experience reduced snowfalls. Conditions are also drier than normal from December to February in south-central Africa, mainly in Zambia, Zimbabwe, Mozambique, and Botswana. Direct effects of El Niño resulting in drier conditions occur in parts of Southeast Asia and Northern Australia, increasing bush fires, worsening haze, drier-than-normal conditions are also in general observed in Queensland, inland Victoria, inland New South Wales, and eastern Tasmania from June to August. As warm water spreads from the west Pacific and the Indian Ocean to the east Pacific, it causes extensive drought in the western Pacific. Singapore experienced the driest February in 2014 since records began in 1869, with only 6.3 mm of rain falling in the month, the years 1968 and 2005 had the next driest Februaries, when 8.4 mm of rain fell. Human activity can directly trigger exacerbating factors such as farming, excessive irrigation, deforestation
4.
Oceania
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Oceania, also known as Oceanica, is a region centred on the islands of the tropical Pacific Ocean. The term is used more specifically to denote a continent comprising Australia. The term was coined as Océanie circa 1812 by geographer Conrad Malte-Brun, the word Océanie is a French word derived from the Latin word oceanus, and this from the Greek word ὠκεανός, ocean. Natives and inhabitants of this region are called Oceanians or Oceanicans, as an ecozone, Oceania includes all of Micronesia, Fiji, and all of Polynesia except New Zealand. New Zealand, along with New Guinea and nearby islands, part of the Philippine islands, Australia, the Solomon Islands, Vanuatu, in geopolitical terms, however, New Zealand, the Solomon Islands, Vanuatu and New Caledonia are almost always considered part of Oceania. Australia and Papua New Guinea are usually considered part of Oceania along with the Maluku Islands, puncak Jaya in Papua is often considered the highest peak in Oceania. Oceania was originally conceived as the lands of the Pacific Ocean and it comprised four regions, Polynesia, Micronesia, Malaysia, and Melanesia. The area extends to Sumatra in the west, the Bonin Islands in the northwest, the Hawaiian Islands in the northeast, Rapa Nui and Sala y Gómez Island in the east, and Macquarie Island in the south. Not included are the Pacific islands of Taiwan, the Ryukyu Islands and the Japanese archipelago, all on the margins of Asia, and the Aleutian Islands of North America. The islands at the extremes of Oceania are Bonin, a politically integral part of Japan, Hawaii, a state of the United States. There is also a geographic definition that excludes land on the Sunda Plate. Biogeographically, Oceania is used as a synonym for either the Australasian ecozone or the Pacific ecozone, Oceania is one of eight terrestrial ecozones, which constitute the major ecological regions of the planet. The Oceania ecozone includes all of Micronesia, Fiji, and all of Polynesia except New Zealand, New Zealand, New Guinea, Melanesia apart from Fiji, and Australia constitute the separate Australasian ecozone. The Malay Archipelago is part of the Indomalaya ecozone, related to these concepts are Near Oceania, that part of western Island Melanesia which has been inhabited for tens of millennia, and Remote Oceania which is more recently settled. The term is used to denote a continent comprising Australia. New Zealand forms the corner of the Polynesian Triangle. Its indigenous Māori constitute one of the cultures of Polynesia. It is also, however, considered part of Australasia, the history of Oceania in the medieval period was synonymous with the history of the indigenous peoples of Australasia, Micronesia, Melanesia, Polynesia
5.
State of emergency
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A government or division of government may declare that their area is in a state of emergency. This means that the government can suspend and/or change some functions of the executive and it alerts citizens to change their normal behavior and orders government agencies to implement emergency plans. Justitium is its equivalent in Roman law, where Senate could put forward senatus consultum ultimum and it can also be used as a rationale for suspending rights and freedoms guaranteed under a countrys constitution or basic law. The procedure for and legality of doing so varies by country, under international law, rights and freedoms may be suspended during a state of emergency, for example, a government can detain persons and hold them without trial. All rights that can be derogated from are listed in the International Covenant for Civil, non-derogable rights are listed in Article 4 of the ICCPR, they include the rights to freedom from arbitrary deprivation of liberty and to freedom from torture and/or ill-treatment. Constitutions are contracts between the government and the individuals of that country. The International Covenant for Civil and Political Rights is an international law document signed by states, therefore, the Covenant only applies to persons acting in an official capacity, not private individuals. However, signatories to the Covenant are expected to integrate it into national legislation, although this is common protocol stipulated by the ICCPR often this is not strictly followed, enforcement is better regulated by European Convention of human rights. In some situations, martial law is declared, allowing the military greater authority to act. In other situations, emergency is not declared and de facto measures taken or decree-law adopted by the government. Ms. Nicole Questiaux and Mr. Article 4 to the International Covenant on Civil, the European Convention on Human Rights and American Convention on Human Rights have similar derogatory provisions. No derogation is permitted to the International Labour Conventions, some political theorists, such as Carl Schmitt, have argued that the power to decide the initiation of the state of emergency defines sovereignty itself. The state of emergency can, and often has been, abused by being invoked, an example would be to allow a state to suppress internal opposition without having to respect human rights. An example was the August 1991 attempted coup in the Soviet Union where the coup leaders invoked a state of emergency and this provision was much abused during dictatorships, with long-lasting states of siege giving the government a free hand to suppress opposition. State-of-emergency legislation differs in each state of Australia, in Victoria, the premier can declare a state of emergency if there is a threat to employment, safety or public order. The declaration expires after 30 days, and a resolution of either the upper or lower House of Parliament may revoke it earlier, under the Public Safety Preservation Act, a declared state of emergency allows the premier to immediately make any desired regulations to secure public order and safety. However, these regulations expire if Parliament does not agree to them within 7 days. Also, under the Essential Services Act, the premier may operate or prohibit operation of, as desired, a State of Emergency does not apply to the whole state, but rather districts or shires, where essential services may have been disrupted
6.
Tropical cyclone
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Depending on its location and strength, a tropical cyclone is referred to by names such as hurricane, typhoon /taɪˈfuːn/, tropical storm, cyclonic storm, tropical depression, and simply cyclone. A hurricane is a storm that occurs in the Atlantic Ocean and northeastern Pacific Ocean, a typhoon occurs in the northwestern Pacific Ocean, Tropical cyclones typically form over large bodies of relatively warm water. They derive their energy through the evaporation of water from the ocean surface and this energy source differs from that of mid-latitude cyclonic storms, such as noreasters and European windstorms, which are fueled primarily by horizontal temperature contrasts. The strong rotating winds of a tropical cyclone are a result of the conservation of momentum imparted by the Earths rotation as air flows inwards toward the axis of rotation. As a result, they form within 5° of the equator. Tropical cyclones are typically between 100 and 2,000 km in diameter, Tropical refers to the geographical origin of these systems, which form almost exclusively over tropical seas. Cyclone refers to their nature, with wind blowing counterclockwise in the Northern Hemisphere. The opposite direction of circulation is due to the Coriolis effect, in addition to strong winds and rain, tropical cyclones are capable of generating high waves, damaging storm surge, and tornadoes. They typically weaken rapidly over land where they are cut off from their energy source. For this reason, coastal regions are vulnerable to damage from a tropical cyclone as compared to inland regions. Heavy rains, however, can cause significant flooding inland, though their effects on human populations are often devastating, tropical cyclones can relieve drought conditions. They also carry heat away from the tropics and transport it toward temperate latitudes. Tropical cyclones are areas of low pressure in the troposphere. On Earth, the pressures recorded at the centers of tropical cyclones are among the lowest ever observed at sea level, the environment near the center of tropical cyclones is warmer than the surroundings at all altitudes, thus they are characterized as warm core systems. The near-surface wind field of a cyclone is characterized by air rotating rapidly around a center of circulation while also flowing radially inwards. At the outer edge of the storm, air may be nearly calm, however, due to the Earths rotation, as air flows radially inward, it begins to rotate cyclonically in order to conserve angular momentum. At an inner radius, air begins to ascend to the top of the troposphere and this radius is typically coincident with the inner radius of the eyewall, and has the strongest near-surface winds of the storm, consequently, it is known as the radius of maximum winds. Once aloft, air flows away from the center, producing a shield of cirrus clouds
7.
Rain
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Rain is liquid water in the form of droplets that have condensed from atmospheric water vapor and then precipitated—that is, become heavy enough to fall under gravity. Rain is a component of the water cycle and is responsible for depositing most of the fresh water on the Earth. It provides suitable conditions for many types of ecosystems, as well as water for power plants. The major cause of production is moisture moving along three-dimensional zones of temperature and moisture contrasts known as weather fronts. If enough moisture and upward motion is present, precipitation falls from convective clouds such as cumulonimbus which can organize into narrow rainbands. On the leeward side of mountains, desert climates can exist due to the dry air caused by downslope flow which causes heating and drying of the air mass, the movement of the monsoon trough, or intertropical convergence zone, brings rainy seasons to savannah climes. The urban heat island effect leads to increased rainfall, both in amounts and intensity, downwind of cities, global warming is also causing changes in the precipitation pattern globally, including wetter conditions across eastern North America and drier conditions in the tropics. The globally averaged annual precipitation over land is 715 mm, climate classification systems such as the Köppen climate classification system use average annual rainfall to help differentiate between differing climate regimes. Rainfall is measured using rain gauges, rainfall amounts can be estimated by weather radar. Rain is also known or suspected on other planets, where it may be composed of methane, neon, sulfuric acid, or even iron rather than water. Air contains water vapor, and the amount of water in a mass of dry air. The amount of moisture in air is commonly reported as relative humidity. How much water vapor a parcel of air can contain before it becomes saturated, warmer air can contain more water vapor than cooler air before becoming saturated. Therefore, one way to saturate a parcel of air is to cool it, the dew point is the temperature to which a parcel must be cooled in order to become saturated. There are four mechanisms for cooling the air to its dew point, adiabatic cooling, conductive cooling, radiational cooling. Adiabatic cooling occurs when air rises and expands, the air can rise due to convection, large-scale atmospheric motions, or a physical barrier such as a mountain. Conductive cooling occurs when the air comes into contact with a surface, usually by being blown from one surface to another. Radiational cooling occurs due to the emission of infrared radiation, either by the air or by the surface underneath, evaporative cooling occurs when moisture is added to the air through evaporation, which forces the air temperature to cool to its wet-bulb temperature, or until it reaches saturation
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