Walking along a beach, watching the waves roll in as they have done for millions of years, our time here does indeed seem short. But if you think of each generation as a single wave washing up against the shoreline, then you can begin to sense our cumulative impact. Unfortunately, in geologic terms we are not waves gently lapping up against the shoreline. We are a sudden and powerful tsunami, a cataclysmic tidal wave washing away everything in its path, forcing every living thing to either flee to higher ground or perish. And our human wave has yet to peak.