A major theme in Milk, the Sean Penn movie which opens in the UK today, is that you can't have political activism without a message of hope.
That's a tough call for climate-change campaigners when James Lovelock is available for interview. He tells this week's New Scientist that rising temperatures will place a huge pressure on food resources and the human population this century will probably shrink to one billion or less.
Week in wildlife – in pictures: a lazy leopard, a moonwalking elephant and
hitchhiking ducklings
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The best of this week’s wildlife photographs from around the world
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