Science behind carbon emissions
Scientists have shown in the last two decades that Climate Change (Global Warming) is very real and caused by carbon emissions. There is scientific backing that proves that we, humans, have contributed to this phenomenon. In January 2001, the Intergovernmental Panel on Climate Change (IPCC), stated “An increasing body of observations gives a collective picture of a warming world and other changes in the climate system… There is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities,” thus supporting the claim. It has led scientists to believe that there is over 90% certainty that human activities are the cause for global warming by emitting carbon into the atmosphere. Some of the phenomena we have seen are the continual rise of the temperature of the Earth’s atmosphere, the greater frequency of hurricanes and flooding due to the melting of polar ice caps. We may be seeing just the beginning of the catastrophic damage caused by global warming. Scientists around the world have urged politicians, industries alike to take proper action in diverting this worldwide disaster.
Human activities, primarily the burning of fossil fuels (coal, oil, and natural gas), and secondarily the clearing of land, have increased the concentration of carbon dioxide, methane, and other heat-trapping (“greenhouse”) gases (carbon, methane) in the atmosphere which lead to the greenhouse effect. It starts with the 50% of sunlight that is absorbed by the Earth’s surface which radiates energy in the infrared region. Greenhouse gases in the atmosphere absorb most of the infrared radiation emitted by the surface and pass the absorbed heat to other atmospheric gases through molecular collisions. The greenhouse gases then radiate in the infrared range downward towards the earth. With increasing amount of greenhouse gases in the atmosphere, a greater warming effect caused by greenhouse gas effect leads to global warming.
Much of the carbon dioxide released is due to the burning of fossil fuels. Fossil fuels contain carbon from plants and animals that were fossilized over millions of years ago. When the fossil fuels are burned, they interact with the oxygen in the air to release carbon dioxide gas. When the carbon dioxide is released in the atmosphere it emits radiation in the thermal infrared region leading to overall rise in temperatures.
Carbon dioxide’s molecular structure allows for absorption and emission of heat. It consists of one carbon atom with an oxygen atom bonded to each side. When its atoms are bonded tightly together, the carbon dioxide molecule can absorb infrared radiation released by the Earth’s surface. The molecule starts to vibrate and eventually, the vibrating molecule will emit the radiation again, and it will likely be absorbed by yet another greenhouse gas molecule. This absorption-emission-absorption cycle serves to keep the heat near the surface, effectively insulating the surface from the cold of space.
Water vapor, methane, nitrous oxide, and a few other gases are also greenhouse gases and contribute to the warming of the earth’s atmosphere. They all are molecules composed of more than two component atoms, bound loosely enough together to be able to vibrate with the absorption of heat. The major components of the atmosphere that do not contribute to the greenhouse effect are gases such as oxygen, nitrogen, i.e two-atom molecules that are too tightly bound together to vibrate and thus they do not absorb any heat.
Some of the statistics taken from scientists who have measured the environmental impact of global warming in the past two centuries share some disturbing facts. Measurements from Antarctic ice cores show that before industrial emissions started atmospheric CO2 levels were about 280 parts per million by volume (ppmv), and stayed between 260 and 280 during the preceding ten thousand years.

Carbon dioxide concentrations in the atmosphere have gone up by approximately 35 percent since the 1900s, rising from 280 parts per million by volume to 387 parts per million in 2009. Carbon dioxide emissions are growing at an alarming rate. Recent data shows that in the 1960s, the average annual increase was only 37% of what it was in 2000 through 2007. The first 50 ppmv increase took place in about 200 years, from the start of the Industrial Revolution to around 1973; however the next 50 ppmv increase took place in about 33 years, from 1973 to 2006. These numbers predict that as the world continues to populate and thrive and there is greater demand for energy, without some form of regulation of carbon emissions.
Under the EU ETS, large emitters of carbon dioxide within the EU monitor and annually report their CO2 emissions, and they are obliged every year to return an amount of emission allowances to the government that is equivalent to their CO2 emissions in that year. In order to neutralize annual irregularities in CO2-emission levels that may occur due to extreme weather events (such as harsh winters or very hot summers), emission allowances for any plant operator subject to the EU ETS are given out for a sequence of several years at once. Some emitters get the allowances for free from the EU member states’ governments, but some changes have been since then. Besides receiving this initial allocation on a plant-by-plant basis, an operator may purchase EU allowances (carbon credits) from others (emitters, traders, the government.) If an emitter has received more free allowances than it needs, it may sell their carbon credits to someone else.
In order to make sure that real carbon trading emerges (and that CO2 emissions are reduced), EU governments must make sure that the total amount of allowances issued to installations is less than the amount that would have been emitted under normal circumstances. For each Phase, the total quantity to be allocated by each Member State is defined in the Member State National Allocation Plan (NAP) (equivalent to its UNFCCC-defined carbon account.) This method has been hugely criticized due to ‘grandfathering’ where the government gifts more allowances to heavy polluters for free. An amendment has been approved abolishing the NAP by 2013. The end result is for each Member State to meet the Kyoto target.
The U.S. Environmental Protection Agency’s (EPA) Acid Rain Program (ARP) was instituted in 1990 under Title IV of the Clean Air Act (CAA) and was established by EPA in 1995. The ARP regulates the sulfur dioxide (SO2) and nitrogen oxides (NOx) emissions which are the primary causes of acid rain. The goal was to reduce S02 emissions by 10 million tonnes from 1980 levels. In 2000, the Act also called for 2 million tonnes of NO2 emissions to be reduced which according to EPA has largely been achieved. The ARP is viewed as one of the more successful federal regulatory programs within the last 10 years with annual benefits exceeding costs by a factor of 40 to 1. EPA has used the ARP fundamental elements as a model for other cap-and-trade programs, including the NOx Budget Trading Programs (NBTP), which went into effect in 2003, and the published Clean Air Interstate Rule (CAIR) and Clean Air Mercury Rule (CAMR) in 2005. CAIR will permanently cap emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) in the eastern United States, specifically 28 eastern states and the District of Columbia. CAIR will reduce SO2 emissions in these states by over 70 percent and NOx emissions by over 60 percent from 2003 levels. This will result in $85 to $100 billion in health benefits and nearly $2 billion in visibility benefits per year by 2015 and will substantially reduce premature mortality in the eastern United States. 
