Time was, genetic engineers were putting jellyfish genes in everything to see what crazy animals they could get to glow in the dark.  Now, however, they’re doing quite a bit more.  The journal Proceedings of the National Academy of Sciences has a few articles on various uses for genetically modified plants.  Two papers discuss using trees to remove harmful chemicals from the atmosphere, the third identifies a way to modify the Chlamy (a green alga) to produce hydrogen.  It seems that algae may be the future of biofuels, after a report on using algae to produce a type of biodiesel.