it is from the 0.3% on the surface that it draws 59% of its needs.

这是强调句（国外语法称为：分裂句）。

被强调的成分是介词短语：from the 0.3% on the surface 

去掉 it is...that...，即可清楚：

1. from the 0.3% on the surface it draws 59% of its needs.

2. it draws 59% of its needs from the 0.3% on the surface.

大意是：全人类从地表百分之0.3的水中，获取百分之59的所需。