The Swarm

The world begins to suffer an escalating and sensational series of natural disasters, and two marine biologists begin to develop a theory that the cause lies in the oceans, where an entity know as the Yrr has developed a massive network of single-cell organisms. It is wreaking havoc in order to prevent humankind from destroying the earth's ecological balance forever. The Americans, under the ruthless General Judith Lee, take a more pragmatic approach than the scientists, seeking to wipe out the being of the deep. The scene is set for a massive confrontation... From goodreads.