Extra Credit: The 'Killer Typhoon' video presented somewhat conflicting opinions by scientists concerning the direct connection between Global Warming and 'Haiyan'. Nonetheless, they all seem to agree that global warming tend to make tropical storms more if not more .

Powerful.

Explanation:

Global warming tend to make tropical storms more powerful due to increase in the rate of evaporation that provides a constant source of energy transfer to the atmosphere. Increase in global temperature also increases the temperature at the equator which increases the rate of evaporation that is the main cause of producing tropical storms so that's why we can say that global warming is the main cause of producing powerful tropical storms.