In this week's podcast we meet Lawrence Anthony, adventurer, conservationist and head of the Earth Organisation – the man who saved Baghdad Zoo, despite a war raging around him.
No stranger to danger, he also persuaded murderous rebel armies in the Democratic Republic of Congo not to harm the ultra-rare white rhino population, and trained a herd of delinquent elephants to live peacefully near his home in South Africa. Guardian environment correspondent David Adam went to meet him. See pictures of the visit here.
Ian Sample, our science correspondent, talks to physicist Paul Davies, who says that nobody is looking for alien life here on Earth. He reckons it could be right under our noses (in microbial form at least). Or even in them.
And, with the help of environment web editor James Randerson, we hear why trees are getting bigger, the polar ice caps are melting faster and Nasa is releasing rap records.
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