Climate denotes the statistical aggregate of atmospheric conditions—temperature, rainfall, humidity, wind, and pressure—prevailing over a geographic region across decades, in contrast to weather, which describes instantaneous or short-term atmospheric states. The World Meteorological Organization (WMO) standardises the climatological "normal" as the arithmetic mean of conditions over a 30-year reference period, the current baseline being 1991–2020. The scientific study of climate, climatology, draws on the Köppen–Geiger classification (1884, revised 1936), which partitions the globe into tropical, dry, temperate, continental, and polar zones, and is a staple of physical geography across competitive syllabi. Climate is governed by controls including latitude, altitude, distance from the sea (continentality), ocean currents, prevailing winds, and relief.
The Earth's climate system comprises five interacting components—atmosphere, hydrosphere, cryosphere, lithosphere, and biosphere—linked by energy and matter fluxes driven ultimately by solar radiation and modulated by the greenhouse effect. Naturally occurring greenhouse gases (water vapour, carbon dioxide, methane, nitrous oxide) trap outgoing longwave radiation, sustaining a habitable mean surface temperature near 15°C; their anthropogenic enhancement since the Industrial Revolution constitutes the basis of contemporary climate change. The Intergovernmental Panel on Climate Change (IPCC), established in 1988 by the WMO and UNEP, is the authoritative assessor: its Sixth Assessment Report (AR6, 2021–2023) concluded that human influence has unequivocally warmed the planet by roughly 1.1°C above pre-industrial levels. Regional climates such as the South Asian monsoon—driven by differential heating of the Indian subcontinent and the Tibetan Plateau—directly shape the agrarian economies of Pakistan and India.
The international legal architecture rests on the United Nations Framework Convention on Climate Change (UNFCCC, Rio 1992), the Kyoto Protocol (1997), and the Paris Agreement (2015), the last committing parties to hold warming "well below 2°C" and pursue 1.5°C through nationally determined contributions (NDCs). Pakistan, ranked among the most climate-vulnerable nations on the Global Climate Risk Index, suffered catastrophic floods in 2022 that submerged a third of the country and caused over USD 30 billion in damage; this catalysed the establishment of the Loss and Damage Fund at COP27 (Sharm el-Sheikh, 2022), operationalised at COP28 (Dubai, 2023). As of 2026 the climate-finance question—the unmet USD 100 billion annual pledge and the New Collective Quantified Goal agreed at COP29 (Baku, 2024)—dominates negotiations.
For CSS Pakistan Affairs and current-affairs papers, climate is examined both as a physical-geography concept (controls, classification, monsoon mechanism) and as a policy-and-diplomacy theme. Examiners favour questions on Pakistan's climate vulnerability, the 2022 floods, the National Climate Change Policy and the Ministry of Climate Change, and Pakistan's stance in UNFCCC negotiations on equity and loss-and-damage. Candidates should distinguish climate from weather precisely, cite the 30-year WMO normal, and marshal dated COP outcomes and IPCC findings to demonstrate command of both the science and the geopolitics.
Example
In 2022, monsoon-driven floods submerged roughly one-third of Pakistan, displacing over 33 million people and prompting Pakistan to lead developing-nation demands that secured the Loss and Damage Fund at COP27 in Sharm el-Sheikh.
Frequently asked questions
Weather describes short-term, instantaneous atmospheric conditions at a place, whereas climate is the long-term statistical average of those conditions over a region, conventionally a 30-year WMO reference period. Climate is what you expect; weather is what you get.