CLIMATE CONTROL Studies of sediment layers in an ancient Italian lake suggest that carbon emissions from human activities may be delaying the start of Earth’s next glaciation. Volcanic ash forms the darker bands in the rock, which researchers used to date an ancient warm period.
DOLPHIN DEATH Scientists have linked toxic effects of oil spilled in the 2010 Deepwater Horizon disaster to an ongoing surge in stranded and dead dolphins, such as this one, along the Gulf of Mexico coast.
Louisiana Department of Wildlife and Fisheries
UP IN THE AIR Semiarid regions, like this area in Central Australia, may be responsible for the wild variations in the amount of CO2 left free in the atmosphere to warm the planet.
Babies whose eighth month of gestation fell during the 2008 Beijing Olympics were born slightly heavier than babies born a year earlier or later, a stark indication of the effects of pollution on development.