The premise was that global warming caused it but that was not the focus of the movie. The focus was the life on earth afterwards and the good versus evil basic struggles.
The Biblical explanation for the flood varies some say it was localized some say it was figuratively. It does say that there was a mist that encompassed the earth and that it blocked the harmful rays of the sun, kept the temps stable and things did not age (sunlight decomposes organics) lifespans became gradually shorter after the flood in biblical records. There was no rain up to that point as we know it. The bible merely references these events for a larger purpose it is not really a science book as some see it that way but it is remarkable how things written in that time period do reflect on modern science although that was not the point of writing it. Columbus got the idea the earth was round from reading scriptures. Isaiah I believe.
The Biblical explanation for the flood varies some say it was localized some say it was figuratively. It does say that there was a mist that encompassed the earth and that it blocked the harmful rays of the sun, kept the temps stable and things did not age (sunlight decomposes organics) lifespans became gradually shorter after the flood in biblical records. There was no rain up to that point as we know it. The bible merely references these events for a larger purpose it is not really a science book as some see it that way but it is remarkable how things written in that time period do reflect on modern science although that was not the point of writing it. Columbus got the idea the earth was round from reading scriptures. Isaiah I believe.