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See Article History Global warming, the phenomenon of increasing average air temperatures near the surface of Earth over the past one to two centuries.
In the IPCC reported that the interval between and saw an increase in global average surface temperature of approximately 0. The increase is closer to 1. The IPCC stated that most of the warming observed over the second half of the 20th century could be attributed to human activities.
It predicted that by the end of the 21st century the global mean surface temperature would increase by 0. The predicted rise in temperature was based on a range of possible scenarios that accounted for future greenhouse gas emissions and mitigation severity reduction measures and on uncertainties in the model projections.
Some of the main uncertainties include the precise role of feedback processes and the impacts of industrial pollutants known as aerosols which may offset some warming. The assumptions made by each scenario are given at the bottom of the graph.
Such damage would include increased extinction of many plant and animal species, shifts in patterns of agricultureand rising sea levels. The IPCC reported that the global average sea level rose by some 19—21 cm 7.
It also predicted, again depending on a wide range of scenarios, that by the end of the 21st century the global average sea level could rise by another 29—95 cm The scenarios referred to above depend mainly on future concentrations of certain trace gases, called greenhouse gasesthat have been injected into the lower atmosphere in increasing amounts through the burning of fossil fuels for industry, transportationand residential uses.
In the IPCC reported that concentrations of carbon dioxide, methane, and nitrous oxides in the atmosphere surpassed those found in ice cores dating backyears.
Of all these gases, carbon dioxide is the most important, both for its role in the greenhouse effect and for its role in the human economy. It has been estimated that, at the beginning of the industrial age in the midth century, carbon dioxide concentrations in the atmosphere were roughly parts per million ppm.
By the middle ofcarbon dioxide concentrations had briefly reached ppm, and, if fossil fuels continue to be burned at current rates, they are projected to reach ppm by the midst century—essentially, a doubling of carbon dioxide concentrations in years.
Infrared IR radiation is then emitted from the surface. A vigorous debate is in progress over the extent and seriousness of rising surface temperatures, the effects of past and future warming on human life, and the need for action to reduce future warming and deal with its consequences.
This article provides an overview of the scientific background and public policy debate related to the subject of global warming. It considers the causes of rising near-surface air temperatures, the influencing factors, the process of climate research and forecasting, the possible ecological and social impacts of rising temperatures, and the public policy developments since the midth century.A: Here's a simple definition of global warming.
(And yes, it's really happening.) (And yes, it's really happening.) Over the past 50 years, the average global temperature has increased at the. Definition Climate Change.
Climate change is any substantial change in Earth’s climate that lasts for an extended period of time. Global warming refers to climate change that causes an increase in the average temperature of the lower atmosphere. Global warming definition is - an increase in the earth's atmospheric and oceanic temperatures widely predicted to occur due to an increase in the greenhouse effect resulting especially from pollution.
Global warming is the increase of temperature in the Earth’s atmosphere. It occurs due to the increase of greenhouse effect from the pollution. All horrible activities we are doing to our planet will eventually return back to us. Global warming is a long-term rise in the average temperature of the Earth's climate system, an aspect of climate change shown by temperature measurements and by multiple effects of the warming.
The term commonly refers to the mainly human-caused observed warming since pre-industrial times and its projected continuation, though. Q: What is global warming? A: Here's a simple definition of global warming. (And yes, it's really happening.) Over the past 50 years, the average global temperature has .