News bites: Green energy pledges at Rio summit, China's oil imports from Iran, and more

Reuters reports on nations’ pledges to boost clean energy programs at the big United Nations green development summit in Rio de Janeiro.

“U.N. Secretary General Ban Ki-moon said on Thursday that more than 50 governments have launched new energy strategies, while private investors have pledged more than $50 billion to help carry out his goal to double the share of global renewable energy and the rate of energy efficiency improvement by 2030,” the news service reports.

While Secretary of State Hillary Clinton this week said China was taking steps to curb imports of Iranian oil, The Wall Street Journal reports that they’re going back up after earlier declines.

China’s imports from Iran “continued to sharply rebound in May to nearly match 2011 levels following a steep drop-off earlier this year,” the paper reports.

The Washington Post unwraps a new paper in the journal Nature Climate Change in which four researchers call for a new approach to tackling global warming. From the Post item:

Instead of starting with one large, overarching carbon limit dreamed up at U.N. conferences, they argue that countries and cities and companies should take 21 different energy measures that they’re already doing and scale them up. Large corporations are already pledging to clean up their supply chains. Nations are already setting fuel-efficiency standards. And so on. If each of these small measures could just be strengthened, the authors argue, the world might be able to meet its climate goals after all.

The Associated Press reports that troubled natural-gas giant Chesapeake Energy has announced a new chairman.