Is Global Warming All Its Cracked Up To Be

Global Warming is the increase in the average temperature of the Earth's near surface air temperature and oceans since the mid 20th century and its projected continuation. The observed temperature increases since the mid 20th century was very likely caused by increasing concentrations of greenhouse gases resulting from human activity. The concept of global warming is accepted by the mainstream scientific community which has agreed that the effects from global warming will be devastating to our life style and world in general. However this view is not universally accepted and is still in heated debate today. There are some who believe that the concept of global warming is completely false and has no basis or evidence supporting it. Whether they are right or not both sides have very compelling arguments as to how global warming will affect our lives and our world.
The supporters of this theory clearly express that at the rate we are going now there will be catastrophic consequences unless drastic action is taken now. They go on to say that there will be not only harmful environmental effects but equally as harmful economic effects. The environmental effects as a result of global warming are a glacier retreat, Artic shrinkage, and a world wide sea level rise. The resulting effects from these events will be devastating to the world. It will lead to changes in rainfall patterns, extreme weather events, reduction in the ozone layer, changes in agricultural yields, and ocean oxygen depletion. They also are worried about a change to ecosystems and the resulting extinctions that can occur form that change. Along with these environmental effects the economic effects will be equally devastating. They say that the economic effects will be an increase in income inequalities, negative market impacts in developing countries, and would decrease GDP by a few percent. It would affect the livestock, fisheries, forestry, energy, construction, insurance, tourism, and recreation sectors the most.
With all that said the ney sayers say that even if the global warming theory is true the effects that the supporters claim will happen are untrue and grossly misstated. They say that even if global warming happens there will be significantly more positive effects then negative ones. They say that with the climate increase there will be a dramatic boost in plant productivity. They go on to say that the increased temperature will increase the human health around the globe because it is proven that warmer temperatures are conducive to better human health. Overall they say that there will be little to no harmful effects and if any effect at all it will be positive ones.
So I leave the decision to you is global warming all its cracked up to be?