Why are we running out of helium?

Could you elaborate on the reasons behind the diminishing supply of helium? Given its crucial applications in various industries, from cryogenics to medical imaging, it seems alarming that we are running out of this vital element. Are there specific factors contributing to this scarcity, such as a lack of efficient extraction methods or increasing demand? Additionally, what are the potential implications of this shortage, and what steps can be taken to ensure a sustainable supply of helium in the future? Understanding these dynamics is crucial for ensuring the continued advancement of technologies that rely on helium.