贫困加剧的国家发展其农业的失败加剧了由国际食品供应的短缺，这种供应的短缺是由中国和印度不断壮大的中产阶级食用更多肉食产品的饮食变化、商品期货的投机、耕地变为城市的房地产、气候的变化以及将来自食物生产的玉米和甘蔗转化为农业燃料以替代石油所导致的。
不知道对不对，希望指正啊....

我来试试吧，不一定正确，仅作参考。
由于印度和中国膨胀的中产阶级饮食习惯改变为吃更多的肉，对期货的投机，农用地向城市用地的转变，气候的变换以及玉米和甘蔗从用于食物转变为用于燃料生产以取代石油等因素的影响较为贫穷的国家发展农业失败了，这拉紧了国际间的食物供应。

谢谢你们，以后有不会的还会向你们请教的。

1楼和2楼翻译的都不错

With the real estate bubble bursting in 2007 and trading in mortgage-based securities and other derivatives collapsing, hedge funds and other speculative agents, they asserted, moved into speculation in commodity futures, causing a sharp increase in trades and contracts unaccompanied by little or no increase in production of agricultural commodities. It was this move into commodity futures for quick profits followed by a move out after the commodities bubble burst that triggered the rise in the FAO food price index by 71 percent during only fifteen months between the end of 2006 and March 2008 and its falling back after July 2008 to the level of 2006.如何翻译？我怎么翻译过来特别别扭呢？