THERE'S been widespread concern in Kenya over the shrinking of green spaces in Nairobi, the capital city. Most recently, there was uproar over the construction of a raised highway. This resulted in the felling of hundreds of trees, though protests managed to save the life of one 100-year-old fig tree. ERIC FÈVRE, Professor of Veterinary Infectious Diseases, University of Liverpool and International Livestock Research Institute, Kenya, University of Liverpool JAMES HASSELL, Wildlife Veterinarian with Smithsonian's Global Health Program, and adjunct Assistant Professor, Yale University It was also proposed that part of the highway run through Uhuru park – one of…