After Rene Castro-Salazar attended the first U.N.-led climate talks in Berlin in 1985 as Costa Rica's environment and energy minister, he tried to talk about agriculture and climate change — but few wanted to join the conversation.
"There was always opposition — and we couldn't understand why," said Castro, now assistant director-general at the United Nations' Food and Agriculture Organization.
To him, the need to tackle the topic was clear.
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