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Power and movement are the two largest problems with mechs. The biggest breakthroughs will be synthetic muscle type materials, and a power supply that can run them for more than a few minutes. A nuclear power supply using a material like Americium is one proposition, and another possibility could be some kind of superconduction motor/generator. On the tactical side, depending on the design of the mech, you could have a machine that would be far more mobile than a tank, because you could have the ability to move vertically very quickly, as well as horizontally. There are actually two kinds of mech design templates out in circulation. The "humanoid"-type, which is high mobility, and the "machine"-type, which focuses more on heavy armor and weapons. The most well known of the machine-type are the mechs from the Battle Tech or Mech Warrior, and the Gundam units are a humanoid-type.

This is all well and good, but there are still a couple problems. Problem number one: Are the Bio-Fuel farmers actually doing this, and Two: Can you efficiently extract the required components form the grasses?

The Author of this article also has not read the comic books, or even done any in-depth research into the characters he is poking at. 1. Ironman does not use rockets. The "Jets" on his boots are the same as his palm mounted weaponry, which are repulsor pads. These pads produce a repulsive force of some kind, presumably a gravimetric force, but it could also be some kind of electromagnetic wave. His power supply is in his suit, and (in the comics at least) this power supply could be further augmented using such things as high-tension electrical lines. Because of this, it could also be assumed that Ironman's suit could absorb static electricity built up during flight. 2. Storm does not produce lightning bolts as Lee_Jones already pointed out. Looking at some of the older (and better) comicbook story lines, Storm is able to control the weather through some kind of specific telekenesis. This would explain why the weather would change suddenly in accordance with her emotional states. 3. Magneto is also like Storm, in that he has a property specific telekinetic ability (ex. able to effect magnetic objects). Both of these "mutants'" abilities require concentration in proportion to the feat, as a loss of concentration is usually followed by something big going wrong. 4. The Hulk and a number of other characters in the Marvel universe gain special abilities when exposed high levels of radiation due to the fact that they have interesting genetic structures, and the massive amounts of energy simply trigger growth of these abilities. There have been several characters where the deliberate exposure to high yield radiation has caused normal human reactions (ex. Saskquatch, Bucky, etc.) Whether this is at all possible is the question, but it clearly is not.