<prompt> unaweza kugeuza matini haya ya swahilikwa kiingereza?katika karne ya 20, idadi ya watu duniani imeongezeka mara nne zaidi wakati mahitaji ya maji yameongezeka mara tisa zaidi.  <response>: over the last century, the world population has quadrupled, while the water demand has increased sevenfold. 