Greenpeace activists protest against an oil spill in waters off Rio de Janeiro state days ago, on November 18, 2011 in Rio de Janeiro, Brazil. Brazilian authorities warned US energy giant Chevron Thursday that it faces severe punishment if it fails to completely seal an offshore well that has been seeping oil in waters off Rio de Janeiro state. (LUIZA CASTRO/AFP/Getty Images)
Chevron is already treading on eggshells after Brazilian authorities harshly clamped down on the US giant in the wake of a relatively small oil spill in November. Another leak at the same offshore field has now forced a halt in production.