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RENEE MONTAGNE, HOST:

For the Miami Heat, it's three down, one to go. Last night in Miami, the Heat pulled within one win of an NBA championship, with 104 to 98 victory over the Oklahoma City Thunder. That gives Miami a 3-to-1 lead in the series and a comforting statistic for Heat fans to think about until tomorrow night's game 5. No team in NBA history has come back from a 3-1 deficit in the finals. NPR sports correspondent Tom Goldman joins us now to talk about it.

Good morning.

TOM GOLDMAN, BYLINE: Hi.

Leaders of the world's biggest economies wrapped up the G-20 summit in Mexico Tuesday with a promise to work together to promote jobs. The meeting comes amid worrisome signs of slowing growth in the United States and elsewhere.

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LINDA WERTHEIMER, HOST:

Now, for a global perspective on our national weight problem. The number of humans on the planet is now more than seven billion. And our total weight is 287 million tons. That number comes from a new study that suggests weight, and not just headcount, should be considered when looking at the impact of people on the planet.

RENEE MONTAGNE, HOST:

To find out more, we called Ian Roberts. He's a professor at the London School of Hygiene & Tropical Medicine, and is the lead author of this study.

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RENEE MONTAGNE, HOST:

Now, to policy making with some fizz. The mayor of Cambridge, Massachusetts, has proposed limiting the size of sodas and sweetened drinks that can be sold in the city.

Henrietta Davis said she was inspired by the mayor of New York. Michael Bloomberg has proposed a ban on sales of oversized sugary drinks in his city's restaurants. Mayor Davis says soda is a factor behind increasing obesity and heart disease among young people.

A House committee meets to consider a report holding Attorney General Eric Holder in contempt of Congress on Wednesday. Holder failed to turn over subpoenaed documents related to Operation Fast and Furious, a botched gun-trafficking operation. Rep. Darrell Issa met with Holder Tuesday in an effort to resolve difference over his panel's subpoena for the documents.

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.

Former Egyptian President Hosni Mubarak is said to be on life support after suffering a stroke in prison. Meanwhile, demonstrators are still gathered in Tahrir Sqaure protesting moves by the interim military government to seize power.

There hasn't been a school strike in Chicago for 25 years. But the current contract between Chicago teachers and the Chicago Public Schools expires at the end of next week, and tensions between the teachers union, the school district and Mayor Rahm Emanuel are ratcheting higher.

Chicago Teachers Union members outmaneuvered the mayor, school officials and anti-union education groups by overwhelmingly approving a measure that allows teachers to strike if contract negotiations fall flat.