I will mention this now, until I forget: this manga reads from right to left. There's no special meaning to this decision, it's just that I have read so many manga this way, that without even realizing I start drawing that way, too.
@Cherri: hmmm, let's see (I'm not sure either) something large enough to change the Earth, with the possibility of being caused by people (but not a war, something more like an event that could be caused by global warming for example... )
@ebonyhare42: Thanks! ^^ well I got lazy afterwords...I don't know what happened exactly, I lost the contrast too... could blame my lack of experience ^^... this is my first manga, maybe I'll redo it sometime...