The theory of adaptive evolution predicts that organisms which successfully adapt to a certain environment will outcompete other competing life forms to pass on their successful genetic material to future generations. However, adaptive evolution typically occurs after many or hundreds of generations. The effects of climate change can happen extremely quickly. For example, between 2011 and 2014 California witnessed some of the lowest rates of rainfall in almost half a century leading to a water shortage which has led to significant changes happening all at once throughout a large ecosystem. There simply does not appear to be enough time for evolution to be outpacing climate change in order to save many of the complex interactions happening within ecosystems all over the world at this moment.