Greenhouse gases are mostly comprised of carbon dioxide and methane. According to the Environmental Protection Agency (EPA), “greenhouse gas emissions caused by human activities have increased by 14 percent from 1990 to 2008” (Climate, 2010, slide3). In the last century, the carbon dioxide “concentration in the atmosphere has risen from 280 ppm [parts-per-million] to more than 380 ppm because of the industrial activities of humans” (Ruddiman, 2008, p. 86). We’ve had strong levels of carbon dioxide in the atmosphere in the past from volcanoes, but what does this really do to the environment? First off, it raises the temperature, and also the excess carbon dioxide that does not go into the atmosphere eventually gets dissolved in the oceans causing them to acidify.
Artic Ecosystems under Threat 1. Describe the impact of climate change on the ecosystem of Arctic areas. In 2007 the IPCC (Intergovernmental Panel on Climate Change) has provided clear evidence regarding the relative speed of warming in the Artic. The global mean temperature measured at the surface of the planet between 1906 and 2005 increased by 0.74oc. However, surface air temperatures north of 65oN have been warning at roughly twice the global rate for the last four decades (1965-2005).
Even the extensive evidence that high amounts of greenhouse gases do have an impact on the rising temperature many still think all of this is part of the Earth’s natural cycle. During the last century temperatures have increased on a global scale, known as global warming. There has been a sharp rise in average temperature being 0.7°C between 1900 and 200. Scientists believe that this rise in temperature is mainly due to human factors and the increase of industrialisation and the revolution. These industrial activities have raised atmospheric gases such as carbon dioxide which contribute to greenhouse gases.
Evaluate the possible effects of global warming on one tropical region you have studied. (10) Bangladesh is an example of a country that experiences a tropical monsoon climate. Bangladesh is one the most poor and populous countries in the world with over 150 million people living their, many of these people are located in close proximity, giving Bangladesh one of the most densely populated countries in the world. Global warming will bring changes in the magnitude of Bangladesh’s monsoon climate. Bangladesh is expected to see an increase of over 10% in its levels of precipitation by 2050, this will be linked to the increasing temperatures of the bay of Bengal, which if it becomes warmer it means the levels and magnitudes of tropical cyclones, this could cause huge problems for Bangladesh, and cause large numbers of people to move from coastal cities in land, this mass migration may cause tensions between the regions, and may even extend to between countries as many Bangladeshi’s are expected to migrate to neighboring country India.
Global Warming and the Polar Bear Works Cited Missing It was realized that in 1988 that mankind was transforming the atmosphere of our planet (Pearce, 1). Global Warming is a big concern to scientists aside from pollution and is certainly under way. According to the National Academy of Sciences, the Earth's surface temperature has risen by about 1 degree Fahrenheit in the past century, with accelerated warming during the past two decades. Global warming has risen within the last 50 years because of the result of humans activities. These activities have distorted the chemical composition of the atmosphere through the buildup of greenhouse gases – primarily carbon dioxide, methane, and nitrous oxide (EPA, The Climate).
According to the data collected from the latter half of the twentieth century, there is indeed a more pronounced warming of minimum temperatures than maximum temperatures. The minimum temperature of the Wabash Valley Watershed has reached an all-time high for the region, taking into account the entire recorded temperature history. The average annual minimum temperature reached the high of 44 degrees Fahrenheit in 1990, and highs at almost 43 degrees Fahrenheit for the 5-year span, and 42 degrees Fahrenheit for the 10-year
Being that these types of assets are From significant parts of savings, this is a logical argument. 1982 to 1989, the Dow Jones Average went from 884 to 2,509 which drastically increased capital assets’ values. There was an impressive drop in the unemployment rate during Reagan’s administration as well. 17 million new jobs were created and the unemployment rate fell from 9.7% to 5.5% by the time Reagan’s presidential term ended (Niskanen & Moore 1996). The hours worked by working aged adults grew during
Not just one area but globally! That would give us a better indication of global warming. Artic sea ice is another thing we should be monitoring. “September Arctic sea ice is now declining at a rate of 11.5 percent per decade, relative to the 1979 to 2000 average” (Global Climate Change: Key Indicators, 2014). Due to, again warmer temperatures both maximum and minimum we are seeing ice melt.
In 1998, 300 million humans, one in twenty of us, had to leave their homes for a week, and month, a year, forever because of rising waters. (McKibben 682) This is evidence that global warming, or the process of the earth heating up, is really happening. McKibben also says “Severe storms have already grown more frequent and more damaging. The seasons are less steady in their progression. Some agriculture is less reliable” (McKibben 683).
‘Natural’ Climate Change Summary Climate change can be assessed through many different timescales, a shorter time scale would show that climate has only recently began to heat rapidly, suggesting that humans are the only cause of climate change. However by looking at timescales over hundreds of thousands of years, evidence has arose to suggest that the climate goes through heating and cooling periods (ice ages)- the cycle is around about 100’000 years. There is a direct link between the earth’s heating and cooling and the amounts of CO2 in the atmosphere, the graph shows how carbon dioxide levels have changed over the past 400’000 years. It is thought that these changes occur when the amount of solar energy received by the sun fluctuates; this could happen for a number of reasons. The earth is natural at a tilt of 23.5 degrees however this angle change to be one degree less or more around every 41’000 years, if the earth is tilted away one more degrees then less solar energy would be received. The energy received is also affected by how the earth spins on it’s axis, why the earth spins in can sometimes ‘wobble’ on axis creating further and shorter distances from the sun, this varies over 23’000 years.