what is global warming?

Answer 1

Global warming is the observed increase in the average temperature of the Earth's atmosphere and oceans in recent decades and its projected continuation into the future.

Global average near-surface atmospheric temperature rose 0.6 ± 0.2 °Celsius (1.1 ± 0.4 °Fahrenheit) in the 20th century. The prevailing scientific opinion on climate change is that "most of the warming observed over the last 50 years is attributable to human activities" [1].

The main cause of the human-induced component of warming is the increased atmospheric concentration of greenhouse gases (GHGs) such as carbon dioxide (CO2). This leads to warming of the surface and lower atmosphere by increasing the greenhouse effect. Greenhouse gases are released by activities such as the burning of fossil fuels, land clearing, and agriculture.

Answer 2

Global climate is a dynamic process and is always in a state of change, getting hotter or colder or wetter or dryer, regardless of human beings. The statement that most scientists agree that the current warming is caused by human activity is simply not true. I am a biologist working in environmental sciences and know many other scientists in related fields, ecologists, meteorologists, paleontologists and physicists. Most of them believe that what is happening now is just part of the natural variation in climate and the contribution of human activity is tiny compared with the natural forces.

Answer 3

The earth gets warmer and cooler in a natural cycle. At this time the earth is getting a little bit warmer. However, some people think this warming is due to the activities of people in general whereas it is just the ups and downs of the climate.

However, what this natural warming does do is give politicians an excuse to increase the price of fuel of all kinds to hide the REAL problem we all face in the next few years....viz the end of cheap oil...for with the end of cheap comes the end of the world as we know it.

Answer 4

I am not going to answer but rather recommend you a great documentary about it.

Rent the documentary "An Inconvenient Truth"... It is all about global warming, and it is the best documentary you could ever see in your life....

I would never be capable of explaining this matter as well as that documentary does...

Answer 5

http://www.epa.gov/climatechange/index.html

Human activities are changing the composition of Earth's atmosphere. Increasing levels of greenhouse gases like carbon dioxide (CO2) in the atmosphere since pre-industrial times are well-documented and understood.
The atmospheric buildup of CO2 and other greenhouse gases is largely the result of human activities such as the burning of fossil fuels.
A warming trend of about 0.7 to 1.5°F occurred during the 20th century. Warming occurred in both the Northern and Southern Hemispheres, and over the oceans (NRC, 2001).
The major greenhouse gases emitted by human activities remain in the atmosphere for periods ranging from decades to centuries. It is therefore virtually certain that atmospheric concentrations of greenhouse gases will continue to rise over the next few decades.
Increasing greenhouse gas concentrations tend to warm the planet.

Answer 6

Global warming is the observed increase in the average temperature of the Earth's atmosphere and oceans in recent decades and its projected continuation into the future.

Global average near-surface atmospheric temperature rose 0.6 ± 0.2 °Celsius (1.1 ± 0.4 °Fahrenheit) in the 20th century. The prevailing scientific opinion on climate change is that "most of the warming observed over the last 50 years is attributable to human activities" [1].

The main cause of the human-induced component of warming is the increased atmospheric concentration of greenhouse gases (GHGs) such as carbon dioxide (CO2). This leads to warming of the surface and lower atmosphere by increasing the greenhouse effect. Greenhouse gases are released by activities such as the burning of fossil fuels, land clearing, and agriculture.

The measure of the response to increased GHGs, and other anthropogenic and natural climate forcings is climate sensitivity. It is found by observational [2] and model studies. This sensitivity is usually expressed in terms of the temperature response expected from a doubling of CO2 in the atmosphere. The current literature estimates sensitivity in the range 1.5-4.5 °C (2.7-8.1 °F). Models referenced by the Intergovernmental Panel on Climate Change (IPCC) predict that global temperatures may increase by between 1.4 and 5.8 °C (2.5 to 10.5 °F) between 1990 and 2100. The uncertainty in this range results from both the difficulty of predicting the volume of future greenhouse gas emissions and uncertainty about climate sensitivity.

An increase in global temperatures can in turn cause other changes, including a rising sea level and changes in the amount and pattern of precipitation. These changes may increase the frequency and intensity of extreme weather events, such as floods, droughts, heat waves, hurricanes, and tornados. Other consequences include higher or lower agricultural yields, glacier retreat, reduced summer streamflows, species extinctions and increases in the ranges of disease vectors. Warming is expected to affect the number and magnitude of these events; however, it is difficult to connect particular events to global warming. Although most studies focus on the period up to 2100, warming (and sea level rise due to thermal expansion) is expected to continue past then, since CO2 has a long average atmospheric lifetime.

Remaining scientific uncertainties include the exact degree of climate change expected in the future, and especially how changes will vary from region to region across the globe. A hotly contested political and public debate has yet to be resolved, regarding whether anything should be done, and what could be cost-effectively done to reduce or reverse future warming, or to deal with the expected consequences.

Answer 7

a greenhouse is a glasshouse in which plants are kept to protect them from cold weather.The increase in carbon-dioxide is trapping more & more heat in the earth's atmosphere.This trapping of heat is known as the greenhouse effect.This is leading to an increase in heat of the earth and is causing Global Warming.

Answer 8

go through the site and u will get all ur answers http://www.pewclimate.org/global-warming-basics/

Answer 9

warm

Answer 10

Well think of it like this.

When a person sun baths in the summer they get hot and get a tan or even worse, sun burnt.

Its like that only this time its the whole planet we live on which is getting hot and burnt.