GLOBAL WARMING - HOTTEST EARTH DON'T FORGET TO ADD A COMMENT AT THE END OR GO THE BOTTOM OF THE SCREEN TO SEE WHAT OTHERS HAVE WRITTEN |
WE ARE CARETAKERS OF THIS EARTH |
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STANFORD (THEORY) |
“A panel convened by the U.S National Research Council, the nation's premier science policy body, in June 2006 voiced a "high level of confidence" that Earth is the hottest it has been in at least 400 years, and possibly even the last 2,000 years.” |
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NOAA - Predictions for the future temperature increases. (MUST CONFIRM WITH DATA) |
Large and rapid climatic changes affecting the atmospheric and oceanic circulation and temperature, and the hydrological cycle, occurred during the last ice age and during the transition towards the present Holocene period (which began about 10,000 years ago). Based on the incomplete evidence available, the projected change of 3 to 7°F (1.5 - 4°C) over the next century would be unprecedented in comparison with the best available records from the last several thousand years. | ||||
STANFORD |
“Studies indicate that the average global surface temperature has increased by approximately 0.5-1.0°F (0.3-0.6°C) over the last century. This is the largest increase in surface temperature in the last 1,000 years and scientists are predicting an even greater increase over this century. Average global temperatures may increase by 1.4-5.8ºC (that's 2.5 - 10.4º F) by the end of the 21st century.” |
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| NOAA (Must Confirm with Data) |
Due to the enormous complexity of the atmosphere, the most useful tools for gauging future changes are 'climate models'. These are computer-based mathematical models which simulate, in three dimensions, the climate's behavior, its components and their interactions. Climate models are constantly improving based on both our understanding and the increase in computer power, though by definition, a computer model is a simplification and simulation of reality, meaning that it is an approximation of the climate system. The first step in any modeled projection of climate change is to first simulate the present climate and compare it to observations. If the model is considered to do a good job at representing modern climate, then certain parameters can be changed, such as the concentration of greenhouse gases, which helps us understand how the climate would change in response. Projections of future climate change therefore depend on how well the computer climate model simulates the climate and on our understanding of how forcing functions will change in the future. | ||||
| NOAA (Must Confirm with Data) |
The IPCC Special Report on Emission Scenarios determines the range of future possible greenhouse gas concentrations (and other forcings) based on considerations such as population growth, economic growth, energy efficiency and a host of other factors. This leads a wide range of possible forcing scenarios, and consequently a wide range of possible future climates. |
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| NOAA (Must Confirm with Data) |
According to the range of possible forcing scenarios, and taking into account uncertainty in climate model performance, the IPCC projects a best estimate of global temperature increase of 1.8 - 4.0°C with a possible range of 1.1 - 6.4°C by 2100, depending on which emissions scenario is used. However, this global average will integrate widely varying regional responses, such as the likelihood that land areas will warm much faster than ocean temperatures, particularly those land areas in northern high latitudes (and mostly in the cold season). Additionally, it is very likely that heat waves and other hot extremes will increase. | ||||
NASA - Monitoring of the earth is carefully done. (THEORY) |
Climate models and paleoclimate information tell scientists what kinds of symptoms to look for when diagnosing global warming. Ocean temperatures and acidity should rise as the oceans soak up more heat and carbon dioxide. Global temperatures are predicted to increase, with the largest temperature increases over land and at the poles. Glaciers and sea ice will melt and sea levels will rise. Like a patient in a hospital, Earth is closely monitored for these symptoms by a fleet of satellites and surface instruments. NASA satellites record a host of vital signs including atmospheric aerosols (particles from things like factories, fires, or erupting volcanoes), atmospheric gases, energy from Earth’s surface and the Sun, ocean surface temperatures, global sea levels, the extent of ice sheets, glaciers and sea ice, plant growth, rainfall, cloud structure, and more. On the ground, networks of weather stations maintain temperature and rainfall records, and buoys measure deep ocean temperatures. |
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