Mr al-Badri said the world needs an investment blitz of $10 trillion to replace depleting oil fields and to meet extra demand of 17m barrels per day (b/d) by 2040, yet projects are being shelved at an alarming rate. A study by IHS found that investment for the years from 2015 to 2020 has been slashed by $1.8 trillion, compared to what was planned in 2014.