The Climate Change Portal![]() Average surface air temperatures from 2011 to 2020 compared to the 1951-1980 average. Source: NASA. Contemporary climate change includes both global warming and its impacts on Earth's weather patterns. There have been previous periods of climate change, but the current changes are distinctly more rapid and not due to natural causes. Instead, they are caused by the emission of greenhouse gases, mostly carbon dioxide (CO2) and methane. Burning fossil fuels for energy use creates most of these emissions. Certain agricultural practices, industrial processes, and forest loss are additional sources. Greenhouse gases are transparent to sunlight, allowing it through to heat the Earth's surface. When the Earth emits that heat as infrared radiation the gases absorb it, trapping the heat near the Earth's surface. As the planet heats up it causes changes like the loss of sunlight-reflecting snow cover, amplifying global warming. Due to climate change, deserts are expanding, while heat waves and wildfires are becoming more common. Increased warming in the Arctic has contributed to melting permafrost, glacial retreat and sea ice loss. Higher temperatures are also causing more intense storms, droughts, and other weather extremes. Rapid environmental change in mountains, coral reefs, and the Arctic is forcing many species to relocate or become extinct. Climate change threatens people with food and water scarcity, increased flooding, extreme heat, more disease, and economic loss. Human migration and conflict can be a result. The World Health Organization (WHO) calls climate change the greatest threat to global health in the 21st century. Even if efforts to minimise future warming are successful, some effects will continue for centuries. These include sea level rise, and warmer, more acidic oceans. Many of these impacts are already felt at the current 1.2 °C (2.2 °F) level of warming. Additional warming will increase these impacts and may trigger tipping points, such as the melting of the Greenland ice sheet. Under the 2015 Paris Agreement, nations collectively agreed to keep warming "well under 2 °C". However, with pledges made under the Agreement, global warming would still reach about 2.7 °C (4.9 °F) by the end of the century. Limiting warming to 1.5 °C will require halving emissions by 2030 and achieving net-zero emissions by 2050.
Selected article –![]() Wind turbines near Aalborg, Denmark. Renewable energy projects are the most common source of carbon offsets. A carbon offset is a reduction or removal of emissions of carbon dioxide or other greenhouse gases made in order to compensate for emissions made elsewhere. Offsets are measured in tonnes of carbon dioxide-equivalent (CO2e). One ton of carbon offset represents the reduction or removal of one ton of carbon dioxide or its equivalent in other greenhouse gases. Offsets are viewed as an important policy tool to maintain stable economies and to improve sustainability. One of the hidden dangers of climate change policy is unequal prices of carbon in the economy, which can cause economic collateral damage if production flows to regions or industries that have a lower price of carbon—unless carbon can be purchased from that area, which offsets effectively permit, equalizing the price. With the increase of population, more specifically urban population due to densification, there is more of a demand for carbon offset. There are two types of markets for carbon offsets, compliance and voluntary. In a compliance market like the European Union (EU) Emission Trading Scheme, companies, governments, or other entities buy carbon offsets in order to comply with mandatory and legally binding caps on the total amount of carbon dioxide they are allowed to emit per year. Failure to comply with these mandatory caps within compliance markets results in fines or legal penalties. Within the voluntary market, demand for carbon offset credits is generated by individuals, companies, organizations, and sub-national governments who purchase carbon offsets to mitigate their greenhouse gas emissions to meet carbon neutral, net-zero or other established emission reduction goals. The voluntary carbon market is facilitated by certification programs (e.g. Puro Standard, the Verified Carbon Standard, the Gold Standard, and the Climate Action Reserve) which provide standards, guidance, and establish requirements for project developers to follow in order to generate carbon offset credits. Offsets typically support projects that reduce the emission of greenhouse gases in the short- or long-term. A common project type is renewable energy, such as wind farms, biomass energy, biogas digesters, or hydroelectric dams. Others include energy efficiency projects like efficient cookstoves, the destruction of industrial pollutants or agricultural byproducts, destruction of landfill methane, and forestry projects. Some of the most popular carbon offset projects (from a corporate perspective) are energy efficiency and wind turbine projects. Carbon removal offsets include methods based on net-negative products and processes, such as biochar, carbonated building elements and geologically stored carbon (see Carbon Dioxide Removal). (Full article...)Selected picture –Credit: GRID-Arendal Graph summarizing some of the expected impacts of Global Warming according to the Intergovernmental Panel on Climate Change. Temperature deviations are from 1990 readings.
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Mercedes Bustamante is a biologist born in Chile. Most of her work takes place in the savannah regions in Brazil called the cerrado biome. Her area of interests are studying large scale impacts on the environment, land usage and biogeochemistry. Since 1994 she has been an Professor at the University of Brasília (UnB), where she is currently the Graduate Coordinator of the Ecology Department. She is a member of the Climate Crisis Advisory Group. (Full article...)
General imagesThe following are images from various climate-related articles on Wikipedia.
Did you know –Related portalsSelected panorama –Credit: USGS Landsat Project: Warming Island – comparison of satellite pictures between 1985 and 2005. Warming Island, Greenland: On January 16th, 2007, the New York Times reported that a new island had been found in Greenland. Warming Island was once thought to be an ice-covered peninsula, but it was exposed as an island when a glacier melted to reveal the strait. This image shows satellite pictures of the island in 1985 when the glacier had firmly tied it to the mainland, in 2002 when there was only a thin bridge of ice, and in 2005 when the bridge of ice has broken to reveal an open water strait. More islands like this may be discovered if the Greenland ice sheet continues to disappear.
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