<p>This is becoming a question for epistemology. What do we really know? How do we know we know? Etc.</p>
<p>My personal feeling is that it is not possible to “prove” that something causes something. It is the responsibility of theories to name a “cause”, and if evidence does not support such a theory, then it has to be discarded and a new one is required to replace it.</p>
<p>What science does is focus on the “result” of such causes. In other words, science does not answer the question “why” but “how”.</p>
<p>Perhaps we should stay with religion instead? We don’t need to worry about causation or even correlation; all we need is faith.</p>