Secretary of State John Kerry winged his way Monday from New Zealand to the Middle East on the next leg of what may be his longest trip yet, a journey during which America’s top diplomat will account for roughly 16.5 tons of carbon dioxide emissions. That’s more or less the amount of CO2 – one of the key “greenhouse gases” blamed for global warming – produced by the average American in a full year, according to World Bank data [1]. Climate change features prominently on Kerry’s itinerary on his current trip, an eight-day haul from Washington to New Zealand to...