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What? "Yuan Longping's breakthrough happened in the 70s. The great famine happened in early 60s." This is your own words!

Are you aware that there has been more than one famine in history?

I'm totally lost. Are you implying he's responsible for the great famine somehow?

"Fighting famine" is a generic term. His contributions prevented future famine. That does count as "fighting famine", doesn't it?