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A Saudi billionaire prince has warned that his country's economy faces danger [until / unless] it diversifies away from oil. A whopping 92 per cent of Saudi Arabia's revenue [coming / comes] from oil. Prince Alwaleed bin Talal told his nation's oil [administer / minister] that Saudi needed to reduce its dependence [in / on] oil. His open letter was published for the [globe / world] to see. In it, he warned [others / other] Gulf states and countries in the Organisation of the Petroleum Exporting Countries (OPEC) that [demanding / demand] for oil was "in continuous decline". Prince Alwaleed wrote: "Saudi Arabia is almost [entirely / entire] dependent on oil and this reality is becoming a [source / sauce] of concern for all." The prince is the world's 20th richest person and owns [steaks / stakes] in Apple, Twitter and Citigroup.

Prince Alwaleed warned the biggest [treat / threat] to Saudi Arabia is from fracking – a technology that [distracts / extracts] oil from shale and rock. The United States has [reduced / reduction] its demand for Saudi oil because of its investment in producing its own [for / from] fracking. It hopes to be self-sufficient [in / on] oil by 2020, which would be a huge [puff / blow] for Saudi. Alwaleed recognised this in his letter, stating: "We see that [rising / risen] North American shale gas production is an [inevitable / inevitably] threat." Arabian oil executives have so far dismissed any threat from shale, although OPEC members have said the issue needs to be [addresses / addressed] . The prince encouraged Saudi Arabia [to / for] invest in nuclear and solar energy production.