这句话如何汉译英？

If according to the developed country the environmental product employed people's proportion computation, our country needed the environmental protection jobholders 10,000,000 people in the early 90s. If the environmental protection technical personnel according to the environmental protection jobholders' 5% computations, will need 500,000 people. But the present our country environmental product's jobholders actually only have 3,500,000 people, technical personnel less than 200,000 people. To 2010, estimated that China will net gain 150 ten thousand employment opportunities at least.
如果按照发达国家90年代初期环保产业就业人员的比例计算，我国需要环保从业人员1000万人。如果环保技术人员按环保从业人员的 5% 计算，将需要50万人。而目前我国环保产业的从业人员却仅有350万人，其中技术人员不到20万人。到2010年，预计中国将至少净增加150 万个就业机会。