Back then, the field of conservation was dominated by the fortress model: You draw a line, build a wall, hire guards and keep local people out, but it wasnt really working to stop poaching. There needs to be a real incentive for local people to care about conservation.

Who said: "Your time is limited, so don't waste it living someone else's life. Don't be trapped by dogma – which is living with the results of other people's thinking."?

• A. Nelson Mandela
• B. Mark Zuckerberg
• C. Steve Jobs
• D. James Cameron