Climatic Change

Climatic Change
Name	Climatic Change
Region	Global
Period	Holocene–Present
Causes	Natural forcings; anthropogenic greenhouse gas emissions
Effects	Temperature rise; sea level rise; extreme weather
Mitigation	Emissions reduction; carbon sequestration

Climatic Change Climatic Change refers to long-term alterations in Earth's climate system observed across atmospheric, oceanic, cryospheric, and biospheric components. It encompasses variations driven by natural processes and anthropogenic activities documented by scientific institutions such as the Intergovernmental Panel on Climate Change, National Aeronautics and Space Administration, National Oceanic and Atmospheric Administration, Met Office, and Potsdam Institute for Climate Impact Research. Research on Climatic Change informs international processes including the United Nations Framework Convention on Climate Change, the Paris Agreement, and reports to bodies like the World Meteorological Organization.

Definition and Scope

Climatic Change denotes shifts in statistical properties of climate variables over decades to millennia and includes global and regional phenomena studied by entities such as Royal Society, Max Planck Institute for Meteorology, Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, and Lamont–Doherty Earth Observatory. The scope covers interactions among the atmosphere of Earth, oceanography, cryosphere, and biosphere monitored by observatories such as Mauna Loa Observatory and programs like Global Climate Observing System and Argo (oceanography). Definitions draw on conventions adopted by the United Nations and scientific assessments by the American Geophysical Union and European Space Agency.

Causes and Mechanisms

Causes include natural forcings—solar variability studied by SOHO (spacecraft), volcanic aerosols from events like Mount Pinatubo eruption, and orbital cycles described by Milankovitch cycles—and anthropogenic forcings such as greenhouse gas emissions tracked by International Energy Agency, BP Statistical Review of World Energy, and Global Carbon Project. Mechanisms involve radiative forcing quantified in assessments by IPCC Sixth Assessment Report, feedbacks like ice–albedo processes observed in Greenland ice sheet and Antarctic ice sheet, and carbon cycle dynamics involving Amazon rainforest, Boreal forest, Permafrost, and ocean uptake in regions studied by NOAA Pacific Marine Environmental Laboratory. Climate model projections are developed by centers including Hadley Centre, Geophysical Fluid Dynamics Laboratory, CNRM (Météo-France), and the IPSL (France) using scenarios such as those defined in Representative Concentration Pathways and Shared Socioeconomic Pathways.

Observed Changes and Evidence

Observed changes include global mean surface temperature rise documented by datasets from NASA GISS, HadCRUT, Berkeley Earth, and NOAA National Centers for Environmental Information; shrinking cryosphere evidenced by Arctic sea ice decline, Glacier National Park (Montana) glacier retreat, and mass loss from Greenland Ice Sheet measured by GRACE satellites. Sea level rise is recorded by TOPEX/Poseidon and Jason (satellite) missions and tide gauges maintained by Permanent Service for Mean Sea Level. Extreme events such as heatwaves in European heat wave 2003, tropical cyclone activity studied in Atlantic hurricane season, and droughts affecting regions like Sahel and California are linked to shifts in climate variability described in assessments by IPCC and analyses by institutions like European Centre for Medium-Range Weather Forecasts.

Impacts on Ecosystems and Human Systems

Ecosystem impacts include range shifts observed in species cataloged by IUCN, coral bleaching events in Great Barrier Reef, and phenological changes documented by studies associated with Royal Botanic Gardens, Kew and Smithsonian Institution. Human systems affected include agriculture in regions such as Mekong Delta and Midwest United States, urban heat exposure in cities like Delhi, Tokyo, and New York City, and coastal flooding threats to megacities including Bangkok and Jakarta. Health impacts involve vector-borne disease patterns studied by World Health Organization and economic consequences analyzed in reports by World Bank and International Monetary Fund.

Mitigation and Adaptation Strategies

Mitigation approaches encompass decarbonization via renewable deployment tracked by International Renewable Energy Agency, energy efficiency efforts promoted by IEA, afforestation and reforestation initiatives like those supported by Food and Agriculture Organization, and carbon dioxide removal methods researched at institutions such as Lawrence Berkeley National Laboratory and National Renewable Energy Laboratory. Adaptation strategies include coastal defenses used in Netherlands engineering projects (e.g., Delta Works), water resource management in basins like Colorado River, and climate-resilient agriculture programs supported by CGIAR and FAO. Market and technological tools involve carbon pricing mechanisms in jurisdictions such as the European Union Emissions Trading System and innovations from companies collaborating with Mission Innovation.

Policy, Governance, and Socioeconomic Dimensions

Governance spans multilateral diplomacy under UNFCCC, national commitments like those submitted to Paris Agreement nationally determined contributions, and subnational action by entities such as C40 Cities. Socioeconomic dimensions involve equity debates engaged by Green Climate Fund, loss and damage discussions at conferences of parties, and research by academic centers including Yale Program on Climate Change Communication and Stockholm Environment Institute. Legal and financial instruments include litigation exemplified by cases in Netherlands courts, disclosure frameworks developed by Task Force on Climate-related Financial Disclosures, and investment shifts influenced by BlackRock and World Economic Forum.

Category:Climate