You have new items in your feed. Click to view.
Question and answer
what what is the evidence that global warming is either not occurring or is not caused by humans?
Atmospheric carbon dioxide concentrations are higher today than at any time in at least the past 650,000 years. [ They are about 35% higher than before the industrial revolution, and this increase is caused by human activities, primarily the burning of fossil fuels. Carbon dioxide is a greenhouse gas, as are methane, nitrous oxide, water vapor, and a host of other trace gases. They occur
naturally in the atmosphere. Greenhouse gases act like a blanket for infrared radiation, retaining radioactive energy near the surface that would otherwise escape directly to space. An increase in atmospheric concentrations of carbon dioxide and of other greenhouse gases augments the natural greenhouse effect; it increases the radioactive energy available to Earth’s surface and to the lower atmosphere. Unless compensated for by other processes, the increase in radioactive energy available to the surface and the lower atmosphere leads to warming. This we know. How do we know it? The concentrations of carbon dioxide and other greenhouse gases in atmospheric samples have been measured continuously since the late 1950s. Since then, carbon dioxide concentrations have increased steadily from about 315 parts per million (ppm, or molecules of carbon dioxide per million molecules of dry air) in the late 1950s to about 385 ppm now, with small spatial variations away from major sources of emissions. For the more distant past, we can measure atmospheric concentrations of greenhouse gases in bubbles of ancient air preserved in ice (e.g., in Greenland and Antarctica). Ice core records currently go back 650,000 years; over this period we know that carbon dioxide concentrations have never been higher than they are now. Before the industrial revolution, they were about 280 ppm, and they have varied naturally between about 180 ppm during ice ages and 300 ppm during warm periods (Fig. 1). Concentrations of methane and nitrous oxide have likewise increased since the industrial revolution (Fig. ]
Expert answered|clb61289|Points 73|
Question
Asked 3/14/2013 6:56:54 AM
Updated 3/14/2013 3:52:28 PM
1 Answer/Comment
Get an answer
New answers
Rating

There are no new answers.

Comments
When you take information from another website, please provide a link to your source.

You can review Weegy's basic rules here
Added 3/14/2013 3:52:30 PM
Add an answer or comment
Log in or sign up first.
Questions asked by the same visitor
What types of industries emit the most greenhouses gases?
Weegy: The greenhouse gas released in the greatest amount is carbon dioxide. Most carbon dioxide that is released into the atmosphere is related to burning of fossil fuels, such as oil, coal and natural gas. [ The largest producer of carbon dioxide emissions are power plants that produce electricity. Power plants burn large amounts of coal and must produce power 24 hours a day. Other industries that produce large amounts of carbon dioxide are the transportation industry through the burning of diesel fuel and jet fuel along with iron and steel producers. Methane Methane is 20 times more effective at trapping heat, according to the EPA. The largest producer of methane are natural gas systems through heating of homes and other uses. Farming and farming-related activities makes it the largest industry-producing methane gas. Enteric fermentation, also known as the digestive process in animals, is the second largest producer of methane gas. Manure maintenance is the fifth largest producer of methane. Other large producers of methane gas include landfills, coal mining and waste water treatment facilities. Nitrous Oxides Nitrous oxides are 300 times more efficient at capturing heat than carbon dioxide. The levels of nitrous oxides released into the atmosphere are much lower than carbon dioxide emissions, according to the EPA. The agricultural industry is the largest producer of nitrous oxides through soil management processes, such as the use of fertilizers. Manure management is the third largest producer of nitrous oxides. Other industries producing the largest amounts of nitrous oxides include nitric acid production and adipic acid production. Hydrofluorocarbons Hydroflourocarbons, HFCs, do not deplete a stratospheric ozone, however, it is considered a greenhouse gas by the EPA because of its ability to capture heat in the atmosphere. The largest source of HFCs are through the production of HCFC-22, or hydrochlorofluorocarbons, which are used in ... (More)
Question
Expert Answered
Asked 3/14/2013 6:34:26 AM
0 Answers/Comments
26,188,789 questions answered
Popular Conversations
Used in MLA style instead of noting each source at the bottom of the ...
Weegy: All fields of research agree on the need to document scholarly borrowings, but documentation conventions vary ...
9/24/2016 7:39:25 PM| 3 Answers
What are variable pay plans?
9/24/2016 1:46:45 AM| 1 Answers
Performance incentives include all the following EXCEPT Options ...
Weegy: Performance incentives include all the following EXCEPT? Performance incentives include all the following ...
9/24/2016 1:55:56 AM| 1 Answers
this vitamin includes eight different forms, all of which are ...
Weegy: Antioxidant is a substance that inhibits oxidation, especially one used to counteract the deterioration of ...
9/24/2016 6:48:14 AM| 1 Answers
Define mycosis
9/24/2016 7:01:15 AM| 1 Answers
Weegy Stuff
S
L
P
P
P
P
P
L
Points 933 [Total 5005] Ratings 2 Comments 913 Invitations 0 Offline
S
P
1
L
Points 663 [Total 1543] Ratings 5 Comments 613 Invitations 0 Offline
S
Points 205 [Total 499] Ratings 0 Comments 205 Invitations 0 Offline
S
Points 100 [Total 100] Ratings 0 Comments 100 Invitations 0 Offline
S
L
P
Points 97 [Total 1209] Ratings 0 Comments 97 Invitations 0 Offline
S
Points 72 [Total 72] Ratings 0 Comments 72 Invitations 0 Offline
S
Points 30 [Total 30] Ratings 3 Comments 0 Invitations 0 Offline
S
L
Points 25 [Total 4250] Ratings 1 Comments 15 Invitations 0 Offline
S
L
P
P
P
Points 13 [Total 3875] Ratings 0 Comments 13 Invitations 0 Offline
S
Points 10 [Total 10] Ratings 1 Comments 0 Invitations 0 Offline
* Excludes moderators and previous
winners (Include)
Home | Contact | Blog | About | Terms | Privacy | © Purple Inc.