There's nothing wrong with green technology, but we need green tech that's financially plausible. Things like ethanol actually put out more carbon emissions being made than gasoline does being burned. Hydrogen fuel, on the other hand, is cheap and requires little to no 'refining'.
To be honest, all of them except HTML are rather vital to being a web developer. Hell, you might even want to take the four or five days to learn HTML just to know the basics of it all as well.