The subject of greenhouse gases and the environment is complex. First, humanity would be foolish to think certain types of gas emissions do not harm the environment. Anyone that has flown over the city of Los Angles during the summertime and witnessed the thick brown smog hanging over the city understands carbon is harming the atmosphere in some way. Only the scientists can tell us exactly how. Nevertheless, the earth is like every other organism that it hosts. It has an ability to heal itself to a certain degree. Therefore, the real question is what is the tipping point beyond where the earth can no longer heal itself?
There is evidence on both sides of the debate. Some scientists say the evidence is clear and alarming. The earth is at the tipping point right now. Other scientists use statistical data to show the earth is not warming beyond what it has already done in the past. They say greenhouse gas is not harming the environment. How should humanity proceed when there are two opposing opinions of what the evidence means? Humanity should err on the side of caution and prepare for the worse while hoping for the best. We need to assume the answer is yes. Greenhouse gases harm the environment.