Anuncio
relacionado con: Climate change wikipediaDonate Now! Keep Corporate Polluters Accountable. Wrecking the Planet for Profit is Wrong. Our Planet Is Facing A Climate Crisis. Be Part Of The Solution Now!
- Donate Now
Greenpeace needs your help.
Make a gift today.
- Maximize Your Impact
Make your contribution recurring.
Maximize your impact.
- Help Ban Deep Sea Mining
Act Now: Help Protect Our Oceans
From Destruction.
- Tell Biden To Act Now
USA: Declare A Climate Emergency
Combat the Climate Crisis Now!
- Donate Now
Resultado de búsqueda
In common usage, climate change describes global warming—the ongoing increase in global average temperature—and its effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to Earth's climate.
Un cambio climático se define 1 2 como la variación en el estado del sistema climático terrestre, formado por la atmósfera, la hidrosfera, la criosfera, la litosfera y la biosfera, que perdura durante periodos de tiempo suficientemente largos (décadas o más tiempo) 2 hasta alcanzar un nuevo equilibrio.
- Background
- Detection vs. Attribution
- Key Attributions
- Attribution of 20Th-Century Climate Change
- Scientific Literature and Opinion
- Solar Activity
- Non-Consensus Views
- See Also
- External Links
Factors affecting Earth's climate can be broken down into feedbacks and forcings.:7 A forcing is something that is imposed externally on the climate system. External forcings include natural phenomena such as volcanic eruptions and variations in the sun's output.Human activities can also impose forcings, for example, through changing the compositio...
Detection and attribution of climate signals, as well as its common-sense meaning, has a more precise definition within the climate change literature, as expressed by the IPCC. Detection of a climate signal does not always imply significant attribution. The IPCC's Fourth Assessment Report says "it is extremely likely that human activities have exer...
Greenhouse gases
Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change. CO2 is absorbed and emitted naturally as part of the carbon cycle, through animal and plant respiration, volcanic eruptions, and ocean-atmosphere exchange. Human activities, such as the burning of fossil fuels and changes in land use (see below), release large amounts of carbon to the atmosphere, causing CO2concentrations in the atmosphere to rise. The high-accuracy measurements of atmospheric CO2 conc...
Land use
Climate change is attributed to land use for two main reasons. Between 1750 and 2007, about two-thirds of anthropogenic CO2 emissions were produced from burning fossil fuels, and about one-third of emissions from changes in land use, primarily deforestation. Deforestation both reduces the amount of carbon dioxide absorbed by deforested regions and releases greenhouse gases directly, together with aerosols, through biomass burningthat frequently accompanies it. Some of the causes of climate ch...
Aerosols
With virtual certainty, scientific consensus has attributed various forms of climate change, chiefly cooling effects, to aerosols, which are small particles or droplets suspended in the atmosphere.Key sources to which anthropogenic aerosols are attributedinclude: 1. biomass burning such as slash-and-burn deforestation. Aerosols produced are primarily black carbon. 2. industrial air pollution, which produces soot and airborne sulfates, nitrates, and ammonium 3. dust produced by land use effect...
Over the past 150 years human activities have released increasing quantities of greenhouse gases into the atmosphere. This has led to increases in mean global temperature, or global warming. Other human effects are relevant—for example, sulphate aerosols are believed to have a cooling effect. Natural factors also contribute. According to the histor...
There are a number of examples of published and informal support for the consensus view. As mentioned earlier, the IPCC has concluded that most of the observed increase in globally averaged temperatures since the mid-20th century is "very likely" due to human activities. The IPCC's conclusions are consistent with those of several reports produced b...
Solar sunspot maximum occurs when the magnetic field of the Sun collapses and reverse as part of its average 11-year solar cycle(22 years for complete North to North restoration). The role of the Sun in recent climate change has been looked at by climate scientists. Since 1978, output from the Sun has been measured by satellites:6 significantly mor...
Habibullo Abdussamatov (2004), head of space research at St. Petersburg's Pulkovo Astronomical Observatory in Russia, has argued that the sun is responsible for recently observed climate change. Journalists for news sources canada.com (Solomon, 2007b), National Geographic News (Ravilious, 2007), and LiveScience (Than, 2007) reported on the story of...
How much of the recent CO2 increase is due to human activities?(RealClimate, 2005)Effects of climate change are well documented and growing for Earth's natural environment and human societies. Changes to the climate system include an overall warming trend, changes to precipitation patterns, and more extreme weather.
El término es aplicado por aquellos que "creen que evoca la gravedad de las amenazas que enfrenta el planeta debido a las continuas emisiones de gases de efecto invernadero y puede ayudar a estimular el tipo de voluntad política que ha estado ausente durante mucho tiempo en la defensa del clima". 1 Quienes proponen el término creen que, al igu...
Climate variability includes all the variations in the climate that last longer than individual weather events, whereas the term climate change only refers to those variations that persist for a longer period of time, typically decades or more.
El cambio climático se refiere a los cambios a largo plazo de las temperaturas y los patrones climáticos. Estos cambios pueden ser naturales, debido a variaciones en la actividad solar o...
