By the end of the 21st century close to 10 billion humans may inhabit the Earth. As more and more people compete for space, food and water, some environmentalists say we need to rethink our approach to conservation. Conservation efforts in the coming years, they say, will need to expand beyond protecting endangered species and setting aside wilderness areas to include better ways for humans and wild species to coexist. For this month’s Environmental Outlook join our discussion about what we should be conserving in the years ahead and why...