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There have been recent efforts in Ireland to use renewable energy such as wind energy with large wind farms being constructed in coastal counties such as Mayo and County Antrim. Recently what will be the world's largest offshore wind farm is being developed at Arklow Bank off the coast of Wicklow. It is estimated to generate 10% of Irelands energy needs when it is complete. These constructions have in some cases been delayed by opposition from locals, most recently on Achill Island, some of whom consider the wind turbines to be unsightly. Another issue in the Republic of Ireland is the failure of the aging network to cope with the varying availability of power from such installations. Turlough Hill is the only energy storage mechanism in Ireland.

The three most important international airports in the Republic are Dublin Airport, Cork Airport and Shannon Airport. All provide extensive services to the UK, Europe and North America. The Irish national airline Aer Lingus and low-cost operator Ryanair are based at Dublin. Shannon is an important stopover on trans-Atlantic route for refuelling operations. There are several smaller regional airports in the Republic (Galway Airport, Kerry Airport, Knock Airport, Sligo Airport, Waterford Airport) that mostly limit their services to Ireland and the United Kingdom.

Northern Ireland is an administrative region and one of four constituent parts of the United Kingdom. It is located on the island of Ireland, where it shares a land border with the Republic of Ireland, the only part of the United Kingdom with a land border. It covers 14,139 square kilometres (5,459 square miles) in the north-east of the island of Ireland, about a sixth of the total area of the island, and has a population of 1,685,000 (April 2001) — between a quarter and a third of the total island's population.

With its improved international reputation, Northern Ireland has recently witnessed rising numbers of tourists who come to appreciate the area's unique heritage. Attractions include cultural festivals, musical and artistic traditions, countryside and geographical sites of interest, pubs, welcoming hospitality and sports (especially golf and fishing).

Prior to the Government of Ireland Act 1920 the island had existed for centuries as one unified political entity, either on its own (as the Lordship of Ireland, the Kingdom of Ireland) or as part of the United Kingdom of Great Britain and Ireland. Prior to English rule in mediæval times the island was made up of a patchwork of small kingdoms that were people and clan rather than territory-based. At the top of this system was the Ard Ri or High King of Ireland. See Irish States (1171-present).

Nationalist grievances at Unionist discrimination within the state eventually led to large civil rights protests in 1960s. It was during this period of civil unrest that the Provisional IRA, an extra-legal paramilitary group favouring the creation of a united Ireland, began its campaign of bombings and shootings. Other groups on both the Unionist and nationalist side also began to participate in the violence and the period known as the "Troubles" began. Owing to the civil unrest the British government suspended home rule in 1972 and imposed direct rule.

A number of political parties are represented in the Dáil and coalition governments are common. Neither of the two largest parties, Fianna Fáil and Fine Gael, strongly identifies itself as either a left or right-wing group. The third largest party in the state is the centre-left Labour Party. Labour is joined on the left by the Green Party, Sinn Féin and the Socialist Party. The right is represented by the Progressive Democrats who, while liberal on economic policy, are left-wing on social matters. Independent TDs (MPs) also play an important role in Irish politics.

The all-island Kingdom of Ireland (1541-1801) was incorporated into the United Kingdom in 1801 under the terms of the Act of Union, under which the kingdoms of Ireland and Great Britain merged under a central parliament, government and monarchy based in London. In the early 20th century Unionists, led by Sir Edward Carson, opposed the introduction of Home Rule in Ireland. Unionists were in a minority on the island of Ireland as a whole, but formed a majority in the northern province of Ulster. Therefore, after the First World War, Ireland was partitioned in 1921 under the terms of the Government of Ireland Act 1920 between six of the nine Ulster counties in the northeast (forming Northern Ieland) and the remaining twenty-six counties of the south and west (forming Southern Ireland and became the Irish Free State in 1922). When the latter achieved dominion status, the six Northern Ireland counties — under the procedures laid out in the Anglo-Irish Treaty, 1921 — opted out, and so remain as part of the United Kingdom.

The culture of the people living on the island of Ireland is far from monolithic. Many notable cultural divides exist between the rural people and city dwellers, between the Catholic and Protestant people of Northern Ireland, between the Irish-speaking people within and without the Gaeltacht regions and the English-speaking majority population, between the settled people and the Travellers, and, increasingly, between new immigrants and the native population.

Most Northern Irish Catholics support unification, although opinion polls have shown a minority who support remaining part of the UK, usually while continuing to support nationalist political parties. This proportion has slowly but steadily declined over the course of the Troubles. The proportion of Protestants who wish to join the Republic is smaller. There are also considerable numbers of people who give ambiguous answers to questions about the future constitutional status of Northern Ireland.