Dear Youssef Talbi,
Why don't you consider THE GREEN REVOLUTION as your topic?
This set of initiatives increased agricultural production worldwide, and is credited with saving the lives of one billion people from starvation. Norman Borlaug, who led implementation of the initiatives, received the Nobel Peace Prize for 1970.
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But the aftereffects of the Green Revolution have been devastating... Much controversy, a potentially fruitful topic for your school project.