An upsurge in the amount of extreme weather events, such as wildfires, heat waves, and strong tropical storms, is attributed in part to climate change by some experts and is constantly raising the issue of global warming.
Between 1970 and 2004, global greenhouse gases (GHGs) have increased 70 per cent. Some strongly believe that global warming is a phenomenon due to human activities. They argue that no one has to be an environmentalist to know that those 70% constitute a massive jump in pollutants and a big problem for the effect it has on the planet’s natural temperature. They also believe that it is worse for carbon dioxide; its annual emissions grew by about 80 per cent between the same period. The also argue that our society releases too much carbon dioxide into the atmosphere much faster than plants and oceans can absorb it.
Those who oppose the theory of global warming being promoted by human activities believe that history (the Medieval Warm Period and the little ice age) are good enough to justify today’s warm temperatures and natural phenomenon. The Medieval Warm Period was a time of warm climate in the North Atlantic region, that may also have been related to other climate events around the world during that time which lasted from about AD 950–1250. It was followed by a cooler period in the North Atlantic termed the Little Ice Age.
Despite substantial uncertainties, especially for the period prior to 1600 when data are scarce, the warmest period prior to the 20th century very likely occurred between 950 and 1100, but temperatures were probably between 0.1°C and 0.2°C below the 1961 to 1990 mean and significantly below the level shown by instrumental data after 1980. The heterogeneous nature of climate during the ‘Medieval Warm Period’ is illustrated by the wide spread of values exhibited by the individual records. At that time, CO2 emissions were not as important as they are today; global warming protestors argue that the current warm temperatures are not unusual and are justified by history.
http://www.google.com/imgres?imgurl=http://www.greenworldtrust.org.uk/Images/TPlanetSk/CO2-temp-recent.jpg&imgrefurl=http://www.greenworldtrust.org.uk/Science/Social/Reconsider.htm&usg=__JWLsrVQGZX55XB390Xx3IipsWmA=&h=300&w=392&sz=21&hl=en&start=6&um=1&itbs=1&tbnid=OzjuLkwBaxvzDM:&tbnh=94&tbnw=123&prev=/images%3Fq%3Dcorrelation%2Bbetween%2Bcarbon%2Bdioxide%2Band%2Btemperature%26um%3D1%26hl%3Den%26sa%3DN%26tbs%3Disch:1
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