Global Warming: Mankind's Greatest Threat
Humanity is about to face the most devastating catastrophe that mankind has encountered since the Bubonic Plague during the Middle Ages. This largest threat to humanity is global warming. Sure, some people are still debating if global warming is in progress and the long term effects of pollution in the environment, but the general consensus among most scientists and researchers is that global warming has started and is going to increase at an uncontrollable rate in the very near future.
Either our world leaders are going to recognize global warming as a real threat to humanity and address it properly, or the entire human population may become extinct.
The effects and consequences of global warming are both frightening and overwhelming. Currently, global warming is modestly increasing the average temperatures throughout the world. However, these temperature increases will continue to spiral upwards and cause massive climate changes throughout the world. For instance, these temperature changes will increase the average worldwide rainfall yet decrease rain in some areas, thus negatively affecting farming everywhere. Seasons to grow foods will shorten in some areas and lengthen in other areas, while few farmers will be to adapt to these changes quickly enough. And farmers will be unable to properly change the types of their crops, because the local climate changes will be continuously too unpredictable and changing too quickly.
Eventually, both polar ice caps will start melting at a very fast rate because of global warming. This will cause the world's oceans to rise rapidly. Not quickly enough to cause tsunami like conditions to drown thousands of people, but rather people will be forced to evacuate coastal cities, where most of the world's population now lives, to higher ground that is more inland. No one knows for certain how high the world's oceans will increase; but whatever the height, global warming will decrease the amount of land available for human use. This will decrease the amount of farm land available, thus further decreasing the amount of food mankind can grow. Since a large percentage of the world's population already do not grow enough food, this will cause mass starvations. The sudden increase in population densities in smaller cities not prepared for a surge in population growth will cause huge sanitation issues and diseases will spread much more rapidly, especially with food becoming more scarce.
Furthermore with the ice caps melting, the amount of sunlight reflected back into space will decrease thus increasing the temperature of the Earth even faster. Underneath these receding ice caps and glaciers is dead organic matter that when thawed with release even more heat trapping greenhouse gases (carbon emissions) into the environment. While all this time, humankind will continue to produce an ever increasing amount of carbon emissions via pollution into the environment.
Eventually, global warming will melt enough of the polar ice to modify the world's oceans in two ways. First, the oceans will start to desalinate, in other words the salt in the sea water will be more diluted by the fresh water from the ice. Second, the oceans' water temperature will drop because of the cold melting ice, and this will cause the oceans' currents to change. Since the world's ecosystem is regulated by the ocean's currents, this will cause another ice age. That's right, global warming will start another ice age. Human civilization is not equipped to survive an ice age that will last a few years let alone a few thousand years. No one knows when this ice age will start, but the world's agriculture can not sustain the world's population during an ice age. This may even cause the extinction of mankind.
No one knows when this ice age will happen, but it is coming. We know that the cycle of temperature increases are followed by ice ages, but this time the changes are not natural. These changes are caused by man-made greenhouse gases released in the environment. Therefore scientists believe that the next ice age will start much sooner than the scientific evidence has proven to have happened in the past.
Let's review for a moment. Global warming is the effects of greenhouse causing gases released into the environment that increases the average temperature of the world, thus adding more energy into the atmosphere. This increase in temperature and energy will cause an increase in rain and hurricanes, and wreck havoc to the agriculture of the world's food supply. Eventually, enough of the world's icecaps will melt to increase the world's sea levels, thus further destroying the world's agriculture land. Furthermore, the melting ice water will disrupt the world's oceans that regulate the world's temperatures and cause an ice age. And finally, human civilization currently can not survive an ice age.
As a result, our world leaders have to recognize global warming as a real threat to humanity. They need to both try to slow down global warming and prepare for its eventuality. If they do not, the collapse of the human civilization is almost certain, and the entire human race is at risk of becoming extinct.
by Phil for Humanity