Linda Wertheimer talks to Dr. Ian Roberts, of the London School of Hygiene and Tropical Medicine. Roberts led the research on a new study on global obesity. It shows that weight, not just population size, should be taken into account when planning how to deal with increasing pressure on resources.
Geologists have noticed an increase in the number of small earthquakes in the U.S. They suspect the cause to be wastewater wells, where polluted water from industrial processes is pumped deep underground. None of the quakes has caused serious damage.
The company has spent $4 billion since 2007 on preparations to explore for oil off the north coast of Alaska. Many Alaskans welcome the venture, which could lead to the development of trillions of dollars worth of oil. But not everyone's convinced Shell has all the environmental protections in place to protect areas of the pristine Arctic.
Consumers get agitated when they see apples, celery and red peppers singled out for containing the most pesticide residue. Scientists say it's not such a big deal because the pesticide levels are extremely low.
U.N. Secretary-General Ban Ki-moon wants to kick-start a big initiative to double the share of renewable energy worldwide, make sure everyone on the planet has power, and cut in half the amount of wasted energy. But critics say the agenda in Rio is so bloated that it's unclear what can be accomplished.
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