Africa and climate therefore confront the rational optimist with a challenge, to say the least.

因此，至少可以说，非洲和气候问题将使理性乐观主义者面临挑战。

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Matt Ridley: writer on science and evolution; author of “The Rational Optimist” (to be published by HarperCollins in 2010)

马特•里德利：《科学与进化》作家；

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Sooner or later, the ubiquitous pessimist will confront the rational optimist with his two trump CARDS: Africa and climate.

迟早，无处不在的悲观主义者将会以其手中的两张王牌来面对乐观主义者：非洲和气候问题。

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His book the Rational Optimist, in which he looks at how human prosperity has evolved, was shortlisted for the Samuel Johnson non-fiction prize in 2011.

BBC: Viscount Ridley