About us

1747272 Edgar Daniel Muñoz Barrientos

1752946 Victor Manuel Salinas Garcia

1727856 Mauricio Salazar Ayala

1726157 Damian Alejandro Tarelo Garcia

Group: 202

Teacher: Leilania Lizeth Gómez Ruiz

Global Warming and Greenhouse effect

Global Warming:

Is the increase of Earth´s average surface temperature due to effect of greenhouse gases, such as carbon dioxide emissions from burning fossil fuel or from deforestation, which trap heat that would otherwise escape form earth. 
http://video.nationalgeographic.com/video/101-videos/global-warming-101

Greenhouse Effect:

Is a process by which radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface and the lower atmosphere, ti results in an elevation of the average surface temperature above what it would be in the absence of the gases.

https://www.youtube.com/watch?v=ZzCA60WnoMk

Carbon cycle

Is the circulation of carbon back and forth between living things and the environment. Carbon is an element, something that cannot be broken down into a simpler substance. Other examples of elements are oxygen, nitrogen, calcium, iron, and hydrogen. Carbon compounds are present in living things like plants and animals and in nonliving things like rocks and soil. Carbon compounds can exist as solids (such as diamonds or coal), liquids (such as crude oil), or gases (such as carbon dioxide). Carbon is often referred to as the "building block of life" because living things are based on carbon and carbon compounds.

Step 1: Carbon enters the atmosphere as carbon dioxide from respiration (breathing) and combustion (burning)

Step 2: Carbon dioxide is absorbed by producers to make carbohydrates in photosynthesis. These producers then put off oxygen.


Step 3: Animals feed on the plants. Passing the carbon compounds along the food chain. Most of the carbon these animals consume however is exhaled as carbon dioxide and finally the plants and animals die.

Step 4: The dead organisms are eaten by decomposers in the ground. The carbon that was in their bodies is then returned to the atmosphere as carbon dioxide. 
https://www.youtube.com/watch?v=xFE9o-c_pKg

Main chemical reactions carried out in this cycle and their classification

Photosynthesis:

Photosynthesis is a complex series of reactions carried out by algae, phytoplankton and the leaves in plants, which utilize the energy from the sun. The simplified version of this chemical reaction is to utilize carbon dioxide molecules from the air and water molecules and the energy form the sun to produce a simple sugar such as starch, fats, proteins, enzymes, and DNA/RNA i.e all of the other molecules in living plants. All of the "matter/stuff" of a plant ultimately is produced as a result of this photosynthesis reaction.

Sedimentation:

Carbon dioxide is slightly soluble and is absorbed into bodies of water such as the ocean and lakes. It is not overly soluble as evidenced by what happens when a can of carbonated soda such as Coke is oppened. Some of the dissolved carbon dioxide remains in the water, the warmer the water the less carbon dioxide remains in the water.

Combustion:

Combustion occurs when any organic material is reacted (burned) in the presence of oxygen to give off the products of carbon dioxide and water and energy.

http://www.elmhurst.edu/~chm/vchembook/306carbon.html

Causes and effects of the increasing concentration of CO2 in the atmosphere

Causes:

Fossil fuel combustion/use

The largest human source of carbon dioxide emissions is from the combustion of fossil fuels. This produces 87% of human carbon dioxide emissions.
Electricity/Heat sector
Electricity and heat generation is the economic sector that produces the largest amount of man-made carbon dioxide emissions. This sector produced 41% of fossil fuel related carbon dioxide emissions in 2010
Transportation sector
The transportation sector is the second largest source of anthropogenic carbon dioxide emissions. Transporting goods and people around the world produced 22% of fossil fuel related carbon dioxide emissions in 2010
The industrial sector is the third largest source of man-made carbon dioxide emissions. This sector produced 20% of fossil fuel related carbon dioxide emissions in 2010.

http://whatsyourimpact.org/greenhouse-gases/carbon-dioxide-sources

Effects:

Ocean Acidification

The oceans are the Earth's largest carbon storage medium, so if the atmospheric CO2increase were "natural", it would likely be coming from the oceans.

Oceanic CO2 Rising Fastest at the Surface

If CO2 were being driven into the ocean from the air, the oceanic concentration would rise fastest at the surface.

http://www.skepticalscience.com/co2-increase-is-natural-not-human-caused.htm

Sea level rise - densely settled coastal plains would become uninhabitable with just a small rise in sea level, which would result from melting of the ice caps.

Impacts on agriculture - Global warming could have major effects on agricultural productivity.

Reduction of the ozone layer - Warming would result in increase high cloud cover in winter, giving chemical reactions a platform in the atmosphere, which could result in depletion of the ozone layer.

Increased extreme weather - A warmer climate could change the weather systems of the earth, meaning there would be more droughts and floods, and more frequent and stronger storms.

Spread of diseases - Diseases would be able to spread to areas which were previously too cold for them to survive in.

Ecosystem change - As with the diseases, the range of plants and animals would change, with the net effect of most organisms moving towards the North and South Poles.

Chemical Reaction invloved in Global Warming

How has the human being contributed to the global warming phenomenom

Human industrial activities are believed to be adding to the amount of "greenhouse gases" naturally present in the atmosphere. There are mounting proofs that following the industrial revolution of the 18th and 19th centuries, which commenced in Britain and expanded to several parts of the world, the amounts of carbon dioxide, methane and other greenhouse gases in the atmosphere has inccreased somewhat. Greenhouse gases released from human activities or natural sources and trapped in the atmosphere acting as blanket preventing the earth´s heat from escaping into space, thereby increasing the earth´s temperature, creating variability in the world climate (Climate Change).